I was driving my car today(89 RX-7 GXL) and it stumbled between 3k and 3.5k. Never happened in the higher gears, just 1st and 2nd. By stumble i mean like when someone learns to drive a clutch the first time, and the car shudders a bit, that kind of thing.

The car is totaly stock right now, only had it less than a month. What kinds of things should i look at? I should mention it didn't always do this btw, i got past the trouble range a few times with no problems, also it stumbled once at about 2.5k i think. Only planned maintinence right now is just replacing spark plugs, wires, oil, and oil filter next weekend, should i expect to need to do more to fix this problem(its only happened today btw, on my way home and i havent driven it since then, a little worried). The check engine light does come on momentarily, while its stumbling. Doesn't stay very long though i didn't even notice the first few times.

Any help appreciated, thanks

Journey

 

Might be a bad grond to the coils. I know when my trailing coil was not grounded well, it would stumble, and the engine light would come on. Check those grounds!!

 

it seems ok in wot but its the cruise speed that stumbles or at an idle its like its popping Im gonnna check the coils grounding and then onto the tps sensor anything else i need to look at ?