Please help!!! I have a 2004 dodge ram 5.7 hemi, it starts great may or may not idle and then just dies. When it does idle it will drop and you would think I was pressing gas, if I keep the gas pressed it will stay running. We have replaced the iac, throttle body, battery terminals, even had the battery tested and it was 100%. Took the positive cable off while the truck was running and if I pressed the gas it would stay on, lights would flicker as soon as I let off the gas it died. Can someone please help us? I really need this truck for my job and buying a new one is not an option at this time.

 

Moving to the correct section. Is the check engine light on?

 

We have received codes for misfire and the iac, replaced iac and now have codes po171 and 174 with a freeze frame code of 65. We are at a loss. We also put a vaccum pressure tester on it it tests fine. When it dies the rpm and speedometer bounce.

 

Sounds like either a bad TPS sensor or the throttlebody is dirty and sicking in the idle position. It also acts like there is a vacuum leak somewhere causing the lean condition.