misfire

Hey there, Thought I might ask someone who definitely knows more than I do when it comes to truck repair. Vehicle: 1999 GMC Sierra 1500 5.6L. Problem(s): Check engine light... and trying to get it to pass smog. I went to Autozone and got the vehicle code readout from their doohickey. The...

I have a 1994 Mack, with a V-Mac I system in it, every once in a while it will give me a hiccup when its running, put your foot in the throttle and it goes away. If you get it up to 1700-1800 rpm it will set a check engine light. Check the blink code and its a 3-3 injection pump rpm (engine...