heres the prob....when cold ran fine....got heated to temp...start bucking...no backfires....after warm shut it off ..no restart...checked fuel pressure...40 lbs.....checked fire at plugs...weak yellow spark....tried starting this morning...no start....got fuel...still yellow spark....question is....does this sound like coil or opti??? already replaced ignition module on head and spaced it...just got this car..dont know much history on it...new to lt1's....any advise to find prob would be appreciated....

 

Go for the coil first, if nothing else it is much cheaper than the opti.