I was driving my car to work the other day (about 35-38 miles) and about 1 mile from work my car suddenly died. I was able to get the car to work by letting it sit for a while then restarting it, but every time after some period it would die. It appears to be a heat related issue where something is getting hot and letting it cool down allows the car to be driven for a little bit. When it's running it runs perfectly fine with no issue and when it dies there's no hesitation or anything it just dies flat on it's face.
The car is a 1991 stealth RT/TT with very few mods. I've deleted the clutch booster, replaced the BOV with an evo 9 BOV, replaced the fuel pump with a walboro 255 (I've put about 6000 miles on the car with this fuel pump with absolutely no issues until now), and I removed the relay for the fuel pump and put a jumper wire from the input to the pump output so it's always seeing 12 volts. The car had about 60,000 miles on it when I bought it back in 2018 and it now has about 68k. The first thing I did when I got it was the 60k service and drained the tank and put a new pump/fuel filter in it along with a few other maintenance items like spark plugs, ECU caps, rebuilt the throttle body with MIL spec throttle body shaft seals and all new gaskets, new ISC, etc. I also have a few other mods like a turbo timer, an aftermarket radio, and I may be forgetting a thing or two. The exhaust, intake, and other power mods are all pretty much stock.
I just so happened to have purchased a chromed ecu recently and thought I'd give that a shot to see if it fixes the issue. After installing the chromed ECU today it did not fix the issue. I'm fairly certain something has broken, and if I had to guess I'd say it's something electronic as I would expect a fuel issue to result in bucking/hesitation however this dies immediately as if I've shut the engine off even if I leave it in gear and try to coast. Every time the car dies it will not start back up if I try immediately. I have to wait for a while and then try again and it will start up as if nothing happened and then drive for a while before dying again. It is fairly repeatable it seems as even letting it idle in the driveway results in it dying after a period of time. The gas tank is a little low (~1/8) but again I would suspect a fuel issue would result in bucking/hesitation and not die as suddenly as it does.
Any help is appreciated, thanks.
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