Help! Rough Idle is back.

[RompinRam]

Alright, well my rough idle is back on my 4.7L. Before I fixed it by replacing my TPS. Not sure what is causing it now. But since it has gotten bad again my truck has died 4 times. Mostly when shifting into reverse or park from drive. My buddy who has a shop looked it over and can't find anything wrong with it. He said he thinks it needs a PCM flash. Said there was a Technical Service Bulletin on rough idle for a PCM Flash. Anybody else hear anything about this, or know of anything else I can try before paying for a reflash.

 

[Hemi450hp]

Is it throwing any codes?

 

[RompinRam]

No codes at all. Even hooked up to a scan tool no codes.

 

[Hemi450hp]

I would call the dealership and ask them if there is an updated flash for this problem. They should be able to tell you before you go in and pay for something you dont need.

 

[RompinRam]

Alright I will definitely try that.

 

[RompinRam]

Well just talked to the dealership. He said it should've been flashed when it left the dealership. And for a 9 year old truck it's probably something else causing the problem.

 

[GhostRam94]

hmmm how is your tb looking??? when is the last time you changed your plugs?? wanna try seafoam??

 

[TexasRammer]

When your shifting and it dies, is it immediately after starting it up? I know back when I had problems with my tps if I threw it into reverse too fast after starting up it would die.

 

[RompinRam]

Haven't cleaned tb. Gonna try it this weekend. Changed plugs about a month ago.

 

[RompinRam]

When your shifting and it dies, is it immediately after starting it up? I know back when I had problems with my tps if I threw it into reverse too fast after starting up it would die.

Yeah it's doing that. That's originally why I changed my tps. I find it hard to believe this one went bad already.

 

[TexasRammer]

Ya, you never know. Have you tried testing it?
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[RompinRam]

No I forgot I can do that. I'll give that a shot this week as well and see what happens.