Code 2097

[HStewart]

I have a 2006 Pacifica FWD. It started running really rough last week. 112,000 miles. i purchase a handheld OBD II scanner. It threw two Codes. P0301 (Cylinder #1 misfire) and P2097 (Post Catalyst Fuel Trim System Too Rich Bank 1). i have listen to every shade tree maechanic until i've replaced just about every sensor. They include: Air charge temp, EGR valve, MAP Sensor, Throttle Position Sensor, and the O2 sensor in the Catalytic convertor, replaced all the spark plugs, replaced the coil on #1 and #2 cylinders, new fuel injector on #1 cylinder. i have even drained the fuel out of the tank and filled it full of 89 octane. I am pulling my hair out. I erase the codes and they still come on after driving for about 15 miles. It is "sucking" down the gas. it's probably getting about 8 to 9 miles a gallon. CAN ANYONE HELP and lead me in the right direction?

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[CHRYSLER TECH]

look at mechanical engine issue like compression or valve issue
possible pcm and or wire issue

[HStewart]

You will not believe what it turned out to be! I checked the compression last night (at least on bank 1 the ones i could get to without pulling the intake manifold off). all three of these cylinders had almost the same compression (around 115psi), however when i checked the compression, of course i had to remove the new spark plugs when i put them back in i must have mixed them up putting them back in the cylinders. the mis fire code moved from #1 to #5!!! who would have guessed that a new spark plug (Bosch Platinum Plus) woud have caused it. i dug out the old OE plugs from the trash can and put one back in, just drove 30 miles to work and no issues!

Have you ever seen a $1000. spark plug? i now have one!!!

[CHRYSLER TECH]

use only champion spark plugs not bosh