Volkswagen Jetta 1991 bogging down? We've tried everything we can think of?

Okay, so we really got taken on this POS car. We drove it from Indiana to michigan with no problems. Once it was parked for a couple hours, my husband went to drive it and it started hesitating on acceleration and bogging down at about 30-45 mph. We have tried EVERYTHING we can think of: changed fuel filter, checked catalyctic converter (it was gutted), it has a new exhaust system, replaced the air filter, replaced the exhaust manifold and gasket, new intake manifold and gasket. I don't know what the heck is wrong with this f-ing car.It's almost not worth it to put money into, but my husband is getting so many calls for work and is unable to go without transportation, we just can't afford a new car, even with selling this one. Anyone have any ideas what else it could be? Something with the fuel? I don't know. It sat for a year in storage when we bought it, but we dumped dry gas into it today and nothing new. Any suggestions? Any ideas what could be wrong?