1994 Dodge Shadow overheating problems

So I have a 1994 plymouth sundance 2.2L 5 speed manual, so I just picked this up from some kid for $350, and I bought it knowing it overheated, I recently replaced the thermostat, and both radiatior hoses, obviously drained coolant (didnt flush though) I jacked the front of the car up and let it "burp" the air out of the system seemed to work for awhile but about 15 min later it started overheating so bad I had to shut it off, does not blow hot air! Ever, my bosses brother in law is a mechanic, he says not hot air, its a head gasket, so im gunna try that, any other ideas, the water pump dosent seem to be bad if you squeeze the upper radiator hose you can feel the coolant flowing, any ideas? Also outside of engine is super clean no leaking anywhere no oil even on the outside of the engine, also if left idle for more than 3 or 4 min seems to idle rough, not real rough but almost like a mild miss! Just did cap, rotor, plugs, wires, coil, and air filter
thanks
josh