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P2074 code Rough idle

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Old 09 Jun 2016, 01:36 pm
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Default P2074 code Rough idle

I have a 2007 PT Cruiser Touring. At idle (900-1000 RPM) the engine shakes pretty bad to where you can here it in the cab. I replaced the Pcv Valve, didn't fix it. If I remove a vacuum line (Pcv valve or from the top of the throttle body) it will stop shaking and idle higher (1300-1500 RPM). I can't find any vacuum leaks, just changed the oil and filter and spark plugs and Pcv valve and Cleaned the IAC.
Any ideas would be great. Thank you in advance.

update (06.12.16): I read about the A/C causing issues and throwing additional codes. I started the car and turned on the A/C and the engine bogged down and stopped. Then I checked the codes again and had 2 more P0108 and P0113. I borrowed a code reader from my uncle and it showed a P0481 in addition to the 3 previous. I cleared the codes and started the engine again and the 4 codes were gone and I have a P0302 now and no other codes. the engine acts the same as it did and when the A/C is turned on it fluctuates like it did before but doesn't die. I can not get it to throw the 4 previous codes. I am going to check all wires and plugs again along with the seals on the intake manifold and hopefully have another update today.

Update (06.12.16 pm)
I moved swapped the #2 and #3 plug wires and still have the same P0302 code. This is still the only code I am getting as of now. There is also a tick in the engine that I hadn't noticed before so maybe #2 is getting worse?

This is driving me crazy.

Last edited by Tuttamore; 12 Jun 2016 at 04:57 pm.
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