Mitsubishi Repair: My 95 gst, vacuum leak, types of plugs

Question
I have a 95 Gst...I just bought the car and the intercooler pipeing came off.I fixed the pipeing and it still ran horrible.I pulled the plugs and they where pretty bad.(carbon Build up)So I put new plugs in it..Now it runs horrible I have tried 4 different types of plugs and none of them work...The car idles great but the higher it revs it loses power..And then at about 5grand the car starts missing horrible and jumping..There is not a boost leak from my knowlage and it is still getting boost..I run the car at 10 psi...This is my first mitsu and not sure where to look....

Answer
Charles: You need to have your car coded to see what the computer might tell you is going on with the car. You could have messed up a sensor someplace and so the computer is now not reading it right. Got an AutoZone close by? They will code your car for free.You need to also go get yourself a repair manual for your car, they cost around $20.00 and well worth the money too. Try to buy a Haynes a better manual and less engines in it. You could have a vacuum leak, the fuel pump could be faulty, loose fuel injector wire harness connectors, defectiver computer or information sensors that came out of my repair manual. Look your car is the right year for the bad computers too. A piece will start to die in the computer and with time it kills off the computer. So get that computer checked out too. Hope this helps and God bless: Linda