I have a 304 Code... w/ intermittent misfire. I have replaced plug &
wire. Pulled injector and blew it out and replaced and ran a drop test
on 1-4, which checked O.K. Afterwards, drove for about 30 mi w/ no
misfire and running smooth. Next morning cranked up w/ miss again.
Wondering if it could be trash in fuel rail or what is the likelihood
of coil pack going bad? Ideas?