stumbling idle and backfiring, PLEASE HELP!!!!!

[92 SVX]

Originally Posted by 92_LSL

I wish I had a 5 speed!!!!!
It's a temporary fwd legacy swap until I can afford a five or six speed swap. Could the starter ground contribute to this kind of behavior?

oh, not 5sp, hmm should check that then it could be serious does it check the same way the svx stock trans does?

any bad ground can contribute. As Harvey said

If the engine block is not grounded to the body, spurious voltages can return to the body through the signal wiring carrying control information to the ECU, to change the signals.