After 3 years of near flawless daily service, after an hour drive home up the final hill, my 86 3,2 starts stumbling, jerking and backfiring in second. Clutch in, it idles fine and starts fine. Later in the garage, the idle begins smooth then slowly starts to stumble as well. When I goose it, she coughs and sputters hard and if pressed over 3000 will backfire loudly running rough under a load. This is quite loud and raucaus from the Monty. I have a 1 yr old fuel pump, just tried a new dme relay and the cap and rotor look quite serviceable.
A search of the forum here indicates either plug wires or flywheel sensors. OBTW my tach has also been bouncing 500-1000 over after warming up for the last 5 months. A new alt-VR improved my normal voltage readings but did not fix my tach issues. I will pull my wires and plugs this week.
Seem strange that this came on all of a sudden from purring to coughing. Almost like bad gas or something. Ideas?
