I replaced all the guts in my distributor. Module, rotor, button and cap. I got a distributor out of a local salvage yard and used a couple of parts off of it because the wiring harness was in better shape. The problem I’m having is that it runs good at idle but when I put it in gear it starts to run rough it sounds like it has a big *ss lumpy cam in it. Also the engine light will flash but only when in gear. I’ve checked the wires of the wiring harness and everything looks good. Plugs and wire are about a year old or 10,000 miles. The only thing I can think of is there is a little bit of play in the rotor side to side. Like a 1/8 inch each way. It also does these little backfires When driving. If I’m driving say 40 mph and let off the gas I get these little pops. Any ideas? Thank you in advance