(Forgive the Honda cross-post, but you guys seem to know a lot... I own a Honda too!)
My mechanic completely screwed up my car (95 Nissan 200SX SE-R with the SR20DE engine), and I was hoping someone out there might know how, since he doesn't. I took it in for an oil change and he recommended doing a throttle body cleaning and a fuel injector cleaning. I said what the hell, okay. The result? First, I noticed my car now has a high idle -- about 950 RPM at rest in Drive and 1100-1200 RPM at rest in Neutral -- so it always feels like the engine's cold. It also goes faster when I just let the idle take me along in the parking lot. I took it back to him, he fooled around with it some more but couldn't figure out what's wrong. So it still has those problems, but now (and possibly before) it ACCELERATES ON ITS OWN. If I leave it in Drive without pressing any pedal, it will slowly accelerate all the way up through THIRD gear and at least 22 MPH, possibly higher if I hadn't run out of residential driveway. Scary stuff.
WHAT'S GOING ON??? Thanks for any reply.
In the meantime, don't visit All Tune & Lube in Mountain View (Middlefield Road). Please.