when i push my car a little then come 2 a stop and im in nutural my rpms fall like to 300 and go up and down from 400 to about 700 for a few seconds before it idles normal again. it also starts to miss for a short period of time, could it b the spark plugs?. i changed them on my motor about 3000km ago but that was in tha last 240 after i took it out from my old 240 it sat for about 4 months.
i also have my speed limiter wire cut i herd something about how that mkes a dif