At idle, the engine seems to stutter randomly (meaning not a continous predictable stutter). It seems that the engine is just about to die. The oil pressure and rpm gauges all go down and at night, can sometimes dim my lights (inside and out). Then it saves itself. I've replaced the wiring harness and sparkplugs (champions gapped to .032) about 3 weeks ago. Another thing I've noticed is that sometimes on accelerating from a stop, it stutters there too. Some people have said its the coils. Any ideas?