Question about 2005 Chrysler Pacifica

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My engine runs like the timing is off when I rev it or push down on the gas pedal. 3.5L V6. The engine runs smooth when the rpm's are low, in town driving. When rpm's go high, like climbing a hill, the Pacifica engine starts to run "rough", like the timing is off. I think its the timing system, spark plugs, or bad combustion (poor gas). We have used 89 octane gas every tank since we bought it 2.5 years ago. The engine light comes on and stays on, (it doesn't blink). A tech at the local Aamco station told my wife, he couldn't find a code and couldn't get it to repeat. he thought it might be bad gas. I am going to try a fuel additive. Any suggestions?

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This could be a TPC valve or sensor. That is a throtel position control. Your engine will idle or run at low speed fine or in stop and go traffic but highway driving or climbing a hill when the demand changes to heavy or light consumption it will surge the engine as it can't get a good read on what it is suppose to do. This is a resonable priced part and for about twenty bucks for a CHILTON manuel for your car it will give you step by step instructions on this and almost any project you want to try yourself. They will have these at your autoparts store.

Posted on Oct 05, 2009

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It will start but almost immediately sputters and dies. Can not keep it running. Gas pedal is hard to push down when trying to rev the engine a bit in park.


Sounds like it's time to replace fuel filter, or possibly a bad fuel pump. I'm uncertain why the gas pedal would be hard to push as it most likely isn't a cabled type on that new of a vehicle, but you can check by looking at the top of the pedal itself to see if there is a cable and if it's possibly frayed.

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