Okay, this is a recent thing, and I'm not sure what the cause is. As of a few days ago, I've had 3 problems develop. First, I've got an erratic idle. Sometimes it idles so low, the engine will die if I don't tap the throttle occasionally. Other times it's as high as 1800rpm. It's never consistent either. Sometimes I'll come to a stop and the idle will drop to normal, sometimes below normal, and other times well above normal. If I stab the throttle right, I can get the idle to drop, although this isn't consistently true either.

My second problem is with the throttle response. Sometimes it seems like If I'm cruising, then smash the throttle, there's a brief hesitation before it really takes off. This is especially frustrating, because my car used to have an incredibly sensitive throttle response.

My third problem is the "low coolant" light. It doesn't come on right away, but about 2-3 minutes into driving, it just comes on for no reason. I'm confused because the coolant is full and there are no other coolant-related problems. Actually, my fiancee's 98 T/A is experiencing this very same anomaly, so if anyone has an idea as to what's going on here, I'd really appreciate it!!!

Anyways, if you guys could offer some suggestions, I'd be quite grateful...

Just FYI, my car is nowhere near stock. The only thing I've yet to do with it is a rollcage, forged rotating assembly and a turbo. Pretty much everything else has been modified...

 

It would help just a little bit if you told us what car it is.

 

93 Camaro Z28 M6, was originally an A4, but I swapped it over. That should be irrelevant though, since I made the swap over 3 years ago, and this problem just popped up on Friday...

 

How many miles? What mods exactly?

Your best bet is to scan it and monitor sensor readings, but I'm not sure how that works on '93s

 

almost 140k, but that's way off, seeing how my speedo has been off for the last 6 years with 3.73 gears. Mods? You name it. As I mentioned above, the ONLY remotely relevant things I haven't done is upgrade to a forged rotating assembly and fabricate/install a single turbo setup. 93's use the "old school" method, and I've already scanned it. The only thing that comes up is the knock sensor, which is likely being tripped by my loud, unrestrictive exhaust, and the 1.6 RR's I have on there. Members on another board suggested either the IAC or TPS sensors...