some more info, from my posts about it on PT..
my 93 probe gt atx has 70k miles on her now. It's on he original timing belt and distributor. Recently, it has been acting up at random times. the strange thing is that it will act funny for awhile and then go back to normal completely. I just changed the plugs and wires and the fuel filter, as well as the cap & rotor. I'll be at a light and the rpm's will dip way down, usually stalling the car. The idle & TPS are both set perfectly. It'll start back up, but it struggles and feels like it's misfiring rapidly.. Once I get accelerating it will move.. but up to about 3k rpm's is rough.. Once the car is moving it doesn't feel too bad, but it's obvious that there's some serious problem. This has happened to me 3-4 times now... wtf?? Things I suspect- distributor, bad VAF (no CEL though), timing belt lost a tooth. This is pissing me off, any input would be greatly appreciated. When I let off the gas it seems like the rpm's go lower than usual, almost like it's coming out of gear. That makes me suspect the tranny somewhat.. but how would that have anything to do with the idle problem and the car feeling like it's missing at idle? Being at a stop light at 200 rpms and trying to feather the gas pedal just to keep the car alive is not fun, I need to get this fixed ASAP. Thanks in advance..
i'm very open for suggestions, whatever you think it could possibly be. After just driving home 10 minutes ago from my friend's house where I posted this originally, it was terrible. It seemed fine on startup when in park, but as soon as I put it in drive and was at idle, it started missing like crazy, missing all through first gear, etc. Every time I came to a stop it either idled at 200 rpms or just stalled immediately. I probably stalled 10 times on my way home, that wasn't fun.
At this point I'm thinking its probably either the distributor going bad or the timing belt needs replacement, both of which I could take care of but would obviously not rather do if it's not the problem. A disty from a 95 will work fine w/ a 93, right? 93 cap & rotor should fit on there? Fark!
The fuel filter was replaced about 18k ago so that should be fine. The fuel pump is almost brand new, I replaced it myself with a walbro 190. It really does seem to be electrical... argh. I'm in a really bad mood now cause of this.
Since then I've checked the electrical connection for the CPS, swapped in a new VAF, and am going to go try the distributor right now.