Mt...Thanks for the PDF...I ended up putting in a new MAF. Today the symptoms seemed to get alot worse...drive home Cyl 1 started misfiring at 2200 RPM, followed shortly after by Cyl 2...all other cylinders reported 0 misfires.....as per usual the bank 1 STFT went up all the way to 32 % while the issue was happening....this time it would misfire on both cylinders constantly until I pulled over (60-70 misfires per second)...soon as the RPM's drop below 1500, I can resume acceleration and as long as I accelerate gently it won't misfire.
Finally got a FP gauge on it yesterday and it consistently reads 59 to 62 psi throught the range. Even ran more Injector cleaning fluid through.
What do Cyl 1 and Cyl 2 have in common....and why only those cylinders ? Could this have anything to do with slotting the Dist hold down and rotating it ? The engine idles and does low RPM acceleration smoother than when I picked the truck up new.
From what I understand the sudden increase in STFT to the +15-32 % means that for some reason B1 is running lean on hard acceleration.
I love a challenge but this one has me baffled.
Mike