I also have same problem ; i replace my engine for my 2004 sebring convertible and than i can not go over 2250 rpm that means i can not go over 60 miles ... how can i fix it i have no idea ; i change all the sensors which computer says (camshaft , crankshaft , oxgyen , but stil doesnt work ; one mechanic told me ; u need to check ur timing chainf ; one of them told me u need to check transmissin sensors but i really have no idea ....
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run the fault codes as the ecm should compensate for the extra load on the engine when the ac compressor cuts in
there will be a rpm drop of around 150 rpms when it cuts in then it should settle back to normal rpms and when the ac cuts out the rpms will go up and the settle back to normal
anything else indicates a sensor fault.
I bought cheap $100 fuel pump instead of 200 and have trouble with gauge cutting in and out all the time. Also can't go below 1/4 tank or it will lose prime because check valve doesn't work. Check wires are on good and the numbering. Did similar work to mine. Mine was cutting in and out while driving. Loss power and then gained power back and rpm tach would go nuts. It was the crank sensor.
Most auto stores (Autozone) will use a scantool to tell you what the problem is & clear off the check engine light. It is a free service, but I'd suggest bringing a pen/paper to write down the error code & Google it afterwards. It's definitely handy for getting rid of the check engine light.
Do you have a check engine light on ? Common problem with Chrysler is the crank sensor, won way to check is with a scanner, connect to dlc, and goin to live data stream and watch your rpm if you have no signal while cranking that's your problem,another possible cause could be your anti theft system , is your security light blinking ,staying on or not coming on at all?