4.0 Dies When Rolling to Stop

[Nk9]

Evening Guys

Scowered the threads and cant seem to find a problem similar to mine. Had some recent heat soak issues, turned out to be the fuel pump. Swapped and ran like a champ. ~250 miles of driving later, I'm having a new issue. Cold/hot start fires right up. RPM's are stable around 800 at idle and will drive fine. However, when you take your foot off the gas and slow down coasting, around 30mph and less you can feel it wants to die. By the time you are ready to stop, rpms drop to ~200 and sometimes it will just die. If it doesnt die and you push the gas, it feels bogged down. Eventually it will backfire, lurch forward and your back to driving. When it does die, it fires right back up.

I just swapped the IAC and TPS with no luck. Going to pull the TB and give it a thourough cleaning. Also going to do a round of plugs on it. I know have a vaccum leak somewhere as the blend doors dont work, defrost only. Anyone have any other things to check or had a similar issue?

Thanks in advance.

 

[Moglocker]

Evening Guys

Scowered the threads and cant seem to find a problem similar to mine. Had some recent heat soak issues, turned out to be the fuel pump. Swapped and ran like a champ. ~250 miles of driving later, I'm having a new issue. Cold/hot start fires right up. RPM's are stable around 800 at idle and will drive fine. However, when you take your foot off the gas and slow down coasting, around 30mph and less you can feel it wants to die. By the time you are ready to stop, rpms drop to ~200 and sometimes it will just die. If it doesnt die and you push the gas, it feels bogged down. Eventually it will backfire, lurch forward and your back to driving. When it does die, it fires right back up.

I just swapped the IAC and TPS with no luck. Going to pull the TB and give it a thourough cleaning. Also going to do a round of plugs on it. I know have a vaccum leak somewhere as the blend doors dont work, defrost only. Anyone have any other things to check or had a similar issue?

Thanks in advance.

Fix the vacuum leak

 

[Cedarhouse]

I just created the same post that you did and scrolled down and saw this. No backfiring or lurching forward. Sorry, this is not answering your question, but I wanted to let you know to not feel alone, haha. Dave

 

[Nk9]

I should’ve mentioned my vacuum leak has been there prior to the posted issue. Leak ended up being the elbow under the MAP sensor. Didn't resolve anything.

Rewired the #3/4 injector pigtail as I now have a P0203 code. Issue still persists. Swapped injectors around, still have the code. Also injectors have <500 miles in them. PCM?