Starts, runs 30 seconds, then dies

[94TrackerDriver]

Hello, I have a 1994 Tracker 2wd 8 valve. I bought it a few months back, after driving it home, it would not start back up. Been working on it since with no luck. At this time, after sitting for a day or 2, it starts right up and runs for about 30 seconds then dies. Crank again and nothing (until at least a day later). When it first starts it runs smooth then stumbles and dies like running out of gas. Looking down the throttle body, fuel looks the same though (as it dies). No SES light (or codes). Have already swapped out the distributor, plugs, wires, ignition module, fuel regulator, fuel filter, MAP sensor. Removed and cleaned the throttle body. Checked the fuel pressure and it is good (can hear pump run when turning key on). Gone through the vacuum lines and most of the grounds I could find. Exhaust was terrible when I got it with a huge leak at the manifold/pipe donut. fixed leaks and deleted the cat convert (exhaust complete going out the back though).

Thanks for the great website / forum, wealth of information to say the least!!

94TrackerDriver