93 240sx auto trans 133,000 miles
This has happened a few times, once coming off the highway, a few times in city driving. When I come to a stop at a light, my RPMS have dipped from between 6000-8000 quickly down to below 4000, sort of like a stutter. I thought it would stall, so I shifted to neutral and it became steady again. It also occasionally takes a few seconds to catch when I start it in the morning.
I was told that 240s are prone to moisture sensor problems. Could that be to blame? Or any other ideas? Maybe just a tune up? It's been 20,000 miles since my last.
I'd appreciate any input- I know next to nothing about cars and can't find a trustworthy mechanic. Thanks!