90 Camaro problem, help please

Hello all , I have a 1990 Chevrolet Camaro RS 305 V8. I had the motor rebuit about a year ago and have just recently got the whole car up and running. The car ran fine for the first few months of operation and then it started getting sluggish on me. It would be very slow to accelerate, and would sometimes stall out around turns. Return trips (when the motor was warmer) seemed to make this worse. I had the catalytic converter checked for blockage and everything was ok, but the mechanic there told me I needed a tune up. So I took the car in to replace the plugs, wires, distributor rotor, pcv valve, map sensor,coil, fuel and air filters. After the tune up the car ran beautiful, like it had the first few months after the motor was put back in. 2 Days later the car started acting up again. The same problems as before.I have a mild vibration or a shaking coming from the motor,and is very slow to accellerate. The stalling hasn't happened much since the car doesn't accelerate as fast now. Would anyone possibly be able to help me ? :confused:

uaually a problem that progressivly get's worse with exposure to heat is the ingition module in th distributor is acting up. You could get it tested, make sure they do it multiple times, because it can test fine one time, two even then bad another.

Should it be the module indeed, don't get cheap, GET AN AC/DELCO REPLACEMENT, otherwise you'll have the same problem in no time.

Thank you for the input, I will do as you suggested , and let you know how it went.

Agreed, check the module. If its not AC Delco replace it with one regardless. Also, checking your car for codes may be helpful.