Quote:
Originally Posted by s5uewf
Check alternator and make sure you have enough spark to fire the engine with the plugs in the cylinders/under compression. Perhaps not enough voltage (could be bad or weak grounding too).
I have had backfiring in the past related to low voltage/not enough amps to fire the plugs under load...
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Winner winner chicken dinner...the charging system was checked but turns out the alternator was intermittently failing . I put in a brand new battery and the car ran well but as the alternator couldn’t keep up as soon as the battery went down a bit all the symptoms came back. So alternator is being replaced with a nice new 150amp unit from classic retrofit.
It’s nice to have a solution finally. Thanks for everyone’s input