1991 Toyota Camry Engine continues to misfire.

Engine problem
1991 Toyota Camry 4 cyl Front Wheel Drive Automatic 146, xx miles

I have a 91' Toyota Camry DX with a 4cyl. 3S-FE engine. Recently I decided to check the MAS (mass air flow sensor) and after inspecting it, it looked fine. It wasn't dirty or anything so I reassembled it. I started it back up and the engine was misfiring instantly. I took it to 2 shops and they both said that it was a bad distributor and I would need that, new spark plug wires, spark plugs, rotor and distributor cap. They wanted $650 so I put on the cap, rotor, wires, and plugs in myself and went to the junk yard to pick up a distributor off a Camry with low miles. I got the local vo-tech to put it on and it continues to misfire. The whole ignition system is pretty much completely new and it still is missing and dumping fuel. It gets around 8 MPG, bogs out when I accelerate, idle is up and down, and it smells of raw fuel. Another thing is that when I first start it in the morning with a cold engine he car idles and seems completely fine even though the CHECK ENGINE light is on. It'll idle fine for about 3 minutes and up until the engine warms up a bit that when the car automatically starts revving up and down at idle. When I finally do put it into drive it bogs down but once I get it past 1500 RPM it seems to run like normal and the check engine light disappears until I let go of the gas again. Once the car is close to normal running temp. The light goes away and won't come back up until I start it cold again. I don't know what else it could be and am about to give up. Any ideas?