[DWBOX2000]

My sons Miata was having starting issues. It would be intermittent starting problems. Well one day it just wouldn’t start. Unlike my other cars, I just threw parts at it hoping I would get lucky. New MAF, spark plugs, coils packs, wires, PCV valve, cam sensor, fuel filter, fuel pump. Didn’t fix problem. Anyhow, I start cleaning wires. Eventually I clean the engine ground and it has been starting great ever since. Now, when I come to a stop after warning up a bit, the rpm’s will often drop to 200 when I come to a stop. If I am in gear at 3k or more and put foot on clutch to stop, this problem seems to occur. If I am at a lower rpm, not so much. If I drop into neutral it is usually fine but will act up sometimes. At 200 rpm’s it either dies after sputtering there for a few seconds or putts back up to 1,000. There are no codes. I drove to work this morning (20 mins) and it seemed to be fine when fully warm . It actually was idling at 800 rpm’s. Could just be luck. Also, it drives great when going. Never dies when driving. Any suggestions? I am out of ideas. I tried spraying starting fluid when cool and running, no change in revs.
Thanks.