2002 gmc test drive air fix.hpl not sure want is going on.. all stock no tune, just trying to get it running smoooth i smoked and egr is leaking . ivery small leak thinking a block off plate.. will a have to tune it or just tune off. ??
.. .:2002 gmc test drive air fix.hpl2002 gmc test drive air fix.hpl
2002 GMC 1500HD 6.0 4x4