i have a 02 neon with a 2.0l automatic at idle it idles at about 6-7rpm and shakes really bad im getting a P03000 multiple misfire and a P0301 cylinder 1 misfire the guy before me put new plugs wires coilpack and cylinder 1 injector the car has 105k any ideas on what else i should check when you bring the rpms up past like 1500rpm it smooths out its just at idle the cel will come on and start flashing

 

anyone any ideas?

 

Has the fuel injector and coil pack wiring been checked?

 

Yes I thought plugs were the issue so I swapped out the plugs from a good neon and it ran perfect for hours and hours then the light popped back on randomly

 

What kind of plugs are they? What are they gapped at?