Engine Trouble

I have a 94 st, my buddy took the resinator off and ran straight pipe, put the new muffler on, and power washed the engine. I dont know why? Now the damn car isnt runnig right at all. We tried timing it, that didnt help... changed the distributor, alternator,plugs, wires, and we cannot figure it out. im sick of wasting money so does anyone know what can be my problem?! oh yeah the intake sucks alot of air.

if you still have the stock airbox on, double check your intake piping is on tight between the MAF and throttle body. Sounds like you have a leak in a pipe somewhere because you shouldnt hear rushing air unless you have a CAI or short ram.

I have an aftermarket shortram intake.