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Originally Posted by boscat43
I realy want to sound intelligent when I am on here but sometimes it just doesnt work that way. Could you spell out what you are refering to when you say PCM? If it is the main computer sitting on the fenderwell, I have tried that. Also the distributor is a brand new one, I even spent the extra 50.00 bucks to get a new instead of a rebuilt one.
Thanks again.
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PCM is the Powertrain Control Module which is the main computer. Did the new dist come with a new drive gear (bottom of the dist) or did you use the old one?
I believe you replaced the cats but was a backpressure test done? Just trying to rule out a blocked exhaust especially if old of the old cats broke apart and clogged the muffler.
If the truck is put in 1st gear, do you still have a misfire at midrange RPMs?
Does 3rd gear work better at 60 and will it go higher? Just wondering if this is a tranny issue not an engine issue (except if you feel a mis at idle, not in gear).
//2000CAYukon