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check your battery connections, engine ground, wires going to your coil pack and O2 Sensors...I can't remember...I've had my neon for 8 years and gone through 5 engines, 2 trans, and had just about every problem possible w/ my neon.
the ground that goes from the pass. side fender to the engine. i moved it, right now it is on the pass. side strut tower bolt and goes to one of the bolts on the header.
could that be it.
did you clean the paint off of the area where it bolts to? If so, possibly...I really can't remember what I did to solve the problem...when it comes to me, I'll reply again.