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Dave,that was my first thought when I discovered it didnt mis in gear at 700rpm.As earlier mentioned I checked for crank play and could not get it to move.

Thanks for taking the time to look at my info,it does make it quite odd that it wont miss in gear at 700 rpm.Crank end play was the only thing I could think of.But its tight.I see in all different...

Here is a log from cold start and a log with HP tuners idle raise to 700 rpm.This does not stumble or stutter at all.Slight rough idle at when you see it missing.it revs up fine but these 4.2s kind...

Thanks ScaraEpic22,,I will get that log in the morning when its cold,I just got done doing a injector swap and it didnt make any difference,,just as the coil and plug swap multiple times didnt change...

OEM tune and a log of today as it warms up then it starts the misfiring ,in earlier log holding rpm over 750-800 rpm it doesnt seem to misfire and timing is up.THANKS ! appreciate all help.

I will post the stock tune,ive swapped 3 coils in on #1 plus it had 1 new one. 3 different plugs,it idles at 600 or so,thats when it will idle fine for a bit then the misfires climb to 100 and re set...

fuel pressure good,have not swapped injectors.Would faulty injectors drive timing so low under 750 rpm?

Just bought this 2006 4.2 Envoy,runs good and sounds good for the most part,at idle it throws a p0300 and after a bit p0301

Compression good,did tighten intake bolts.swapped coils and new...

Pulled valve body checked TCC valves free,tested lock up on/off solenoid and modulated TCC solenoid,both tested in spec.Just replaced converter with rebuilt.

new log anyone know where I might go...

Recently bought this truck with 99k mi. trans has clean fluid,pan was clean,im sure it was off not to many miles ago.Before I put a converter in it,im reaching out here for help or advise,I pulled...

Did smoke test found vacuum leak at heat exchanger seal as it exits SC

Anyone else have this problem or know what the OP found?

This helped me.Thanks