5.0 gt issues

I have a 1990 5.0 ho that won't idle for nothing and keeps lightly backfiring . It has new plugs,wires,injectors,distributor cap and rotor,fuel pump . The engine is slightly modded with e303 cam upgraded rocker arms and bored .40 over. I have messed around with the distributor and found good...

I recently bought a 5.0 firstly it had a overheating problem . That was easily fixed by reading the thermostat . Now the car when it rains bogs heavily at all times it idles at or around 500 rpm and always seems like it's dying it will once in a while, well more recently sometimes bog and I'll...