Quote
the fluctuation stops when speed drops to 5mph or less.


This is happening when you are coasting down from speed, with foot off the gas, and clutch in, yes ?

What does it do if you leave it in gear, and coast down with foot off gas ?

Any backfiring/popping ?


C/YA!
Jeff
'88 Trooper
2DR LWB 4ZE1 5SP
bone stock DD