Issue: I seem to get a miss and subsuquent backfires in my collectors at part throttle cruise. It is intermittant-comes and goes at will. I am going to check the following things, please tell me what else I can check.

-verify fuel pressure (recently replaced pump)
-ohm injectors hot & cold
-check plug wires for burns
-check plugs for fouling
-check dist cap/rotor (and obviously the wires for tight connections)

*ignition module/pickup coil/ignition coil new last summer
** stock 20 pound injectors (5.0 TPI setup on 355 block)
***Walbro 65gph fuel pump at stock fuel pressure on stock injectors

Thank You for reading..
Eric

 

Start small, check plugs and wires as stated, and also check for exhaust leaks in that area. I have a crack by the muffler, and I get popping when coming down from a high rpm, I can only assume that yours might act that way if the leak is by the collector.

Good luck

 

Thank you GJ, any more opinions on this?