I have a 1989 jeep grand cherokee v6 automatic, started backfiring in the throttle body and lossing power, when starting up you give it some gas it will die. Ok I have put new fuel injectors and fuel pump on it and new spark plugs and wires, new alternator,new air filter,new TGR value, new fuel filter, have checked the exhaust values , timing, replaced the catalytic converter, I have checked the piston rod they are fine.
I am stuck as to what it could be any ideas or help would be a blessing.

 

what is the compression on all the cylinders ?

 

not for sure I had a garage check that out about 3weeks ago which I was told it was fine.

 

backfires threw the intake happen when eather... a valve is hung open burnt, cam lob gone.... or when there is not enough fuel... and the spark/flame go hunting past the combustion chambor....
check the crank position sensor ?
try another garage ?
we had a truck come in once...had a tune up done and was running ruff.. place that did tune up acually builds race cars... they had 2 plug wires crossed and couldnt find it..

 

V6 for real??? Lol

 

Welcome, from Wisconsin.

 

Moved to tech...

 

I will check this out today and let you know what I find .thank you