UPDATE: I read up on the history of your posts here and it was enlightening. A lot of my advice is duplicate effort so I'm editing my post to take out the stuff you've already tried. If it doesnt make 100% sense that's because I removed some parts. I'll put my updates in bold.
Boy I'm not sure what to say about your idle. It does seem to run really rich at idle (and still rich at WOT).
The way your old posts talked about smelling like unburnt gas and running rich, I think it's likely you have an honest misfire where it's not firing. Why? I have no idea. But at least we have a suspect of the problem. I cant beleive it runs so good at WOT. Do your headlights dim at idle or have low alternator output or something? Do you have bad engine grounds perhaps?
Other things I noticed:
1.) Your tranny is shifting WAY too early!! Thats a cool problem to have. Didn't you mention this problem in another thread? Man it seems tough to have a truck shift too early, usually they shift too high and its a lot harder to bring it down. Has your tranny been rebuilt? It almost shifts like it's got a diesel governor in it. Your 1-2 is 4175 and your 2-3 is 3850. Going into 3rd your converter (stock I assume) is hitting minimum WOT stall of 3000 and just flatlines. So you're definitely leaving some performance on the table. Changing governors is NOT easy (IMO) but it is possible to do in an afternoon. It's just messy and tough to do on your back and that cover can be a real bitch to pry off and reinstall without marring your tranny case and busting/denting the cover. I wonder if you have a real SyTy stock governor.. How about this, if you find you have a non-SyTy governor I'll pay you $25 for it plus shipping? I've got the opposite problem and could use a lower shifting governor.
2.) Your boost control definitely sucks, it looks just like mine did on the stock control. Don't dive into this now, but once you get everything else squared away I'd recommend you try a manual boost control valve set for 14 PSI or whatever you feel your engine can tolerate (less, if its on that shitty 91 octane gas). It will spool up faster and hold the boost CONSISTENT compared to the roller coaster it's doing now. I use the $38 one from
www.boostvalve.com.
After looking at your other Datamaster files, I can almost promise you, you'll never get good boost control with the electronic control. You might as well buy a BoostValve now and never look back. I wasted a lot of time chasing my tail with that and the Boost Valve was like a silver bullet cure. Just be careful to NOT set it higher than what your octane can handle, or you'll blow your engine for SURE. In other words if the stock chip runs 14 PSI don't set it higher than that when using the stock chip becuase with the Boost Valve you take control into your own hands and even if the engine is knocking and crying for help, it cannot lower the boost anymore.
3.) Oh, that 91 octane gas. BOY DOES IT SUCK!!! Your getting a shitload of knock from that garbage, as much as 9*. Is your timing at 0*? If I were you I might try retarding the dist 1-2* as a crude attempt to thwart the knock.
4.) On the bright side, your 100 Octane sample is BEAUTIFUL!! You've got FLAT LINE 0 knock, consider yourself very lucky as that is something lots of SyTys are chasing elusively!! I spent 3 YEARS chasing that and still haven't achieved what you're seeing. Once you get everything sorted out, your truck oughta be a SCREAMER at WOT, having zero false knock like this!
5.) I just had an idea; make sure you've got the correct spark plugs. I apologize in advance if you've already mentioned this and I missed it. I would try the NGK UR5 plug at .030" Gap. They seem to idle the best (yes, better than the CR42TS). They tend to come pretty close to .030-.035" gap right outta the box. They may also reduce your knock at WOT on the 91 octane.
6.) Your RPM looks smooth and correct at WOT, I would tend to believe your ignition is 100% up to par. It seems unlikely (but possible I suppose) that your ignition works perfectly at WOT under load but misfires at idle?
7.) I just wanted to say one more time that I really cant beleive the 91 octane is ACTUALLY THAT BAD, I knew it was bad. But MAN. :tdown: If it were me I would honestly look at moving out of California!! Talk about a hot-rod crutch to have! Well except for the fact that alcohol injection is available...
8.) What did you mean in your old posts when you wrote "Yea, I got a brand new MSD 3Bar chip directly from Summit." What is an MSD 3Bar chip? Summit doesn't really sell anything for the Syclone/Typhoons?
9.) I think your truck is missing at idle in the true sense (spark plug periodically not firing) and I would try to focus on that because it may be causing some of your other issues as well. I guess my reply doesnt solve your problem but I hope it gives you some ideas. I am sure your's is a frustrating situation to be in.
