boost problem

[niteoner]

whats up guys i am new to this forum but i have a boost problem with my galant. the car is fine at idle doesnt jump around and there no vacuum leaks. since the car has stock p.o.s piping i figure that that would be the issuse but its not the car does have a check engine light but i dont see why the car would break up in boost only as if it was hitting a fuel cut.i changed the maf senor and that was not the problem what other senor would cause this problem. could be a knock senor but why would the car be fine at 5psi but break up at 10psi? i dont have a boost control either.

 

[ajpm26]

What is controlling your boost?

 

[GsxEcutioner]

i have that problem over 10 psi too. check your plugs,wires, coil packs, and transistor.

 

[niteoner]

yea im gunna check the plugs and wires today and its running of the internal wastegate

 

[dawid4444]

i had the same problem
it was my coil pack

 

[niteoner]

well i changed my spark plugs and wires and the car runs perfect thanks for the help.