What would the most likely Cause of ........

[Lockman]

...... Getting a single exhaust backfire when fully warmed up to ~165 , & on a straight hi-way , rolling into just about 50 MPH ? Can pretty much 'Feel' it kinda ' Drag ' in the tranny , just before it backfires ? FP does not drop or increase when it Does ?
PS........ I found Zero wiring for the TCC , on a 1982 , Rebuilt . 700R4 ? . Just has the 4 pin connector socket on the tranny ?
Thanks y'all,
....Richie

 

[T- Type Tim]

check the cam sensor and its position

 

[Lockman]

Thanks for this, Tim. I'll recheck it soon. This makes sense.