1996 Mitsubishi Eclipse jerking

1996 MITSUBISHI ECLIPSE
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MITSULUVER
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Engine Performance problem
1996 Mitsubishi Eclipse 4 cyl Front Wheel Drive Manual 127k miles

when i start the car the rpms bounce up and down violently and the check engine light flashes every time they bounce.(check engine light on because i got new headers and o2 sensor messes up) after it is start it like bogs out and dies after a couple minutes. ive had this problem before and it went away since then ive gotten new alternator,battery,and its had the head gasket changed out. for the first 2 weeks i got it back it was running fine until a couple days ago. when the problem first began i changed the spark plugs, plug wires, coil pack, fuel filter and it had no affect. all parts have less then 600 miles on them. when i am driving and release the throttle it starts to jerk more violently then usual so i have to step on clutch. anybody any ideas i need help!!!!
Apr 30, 2010 at 1:17 AM
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RASMATAZ
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Have the computer scanned for code/s-you have a problem within the engine management system that caused the CEL to turn on-This is your starting point of diagnosis,finding out what's going on.
Apr 30, 2010 at 2:13 AM