why is my truck hard to start.. hard to start when it does start it idle fine but when I give it gas it like it wants to or something then once it is warm it idle and drives fine code p0300 and p0420 have been read .. I need help please

why is my truck hard to start.. hard to start when it does start it idle fine but when I give it gas it like it wants to or something then once it is warm it idle and drives fine code p0300 and p0420 have been read .. I need help please 3 Answers

My 96 gmc sierra does not idle right when I start it but levels out after and it smell like gas why? 2 Answers

When I start it it takes around 5 to 10 seconds to idle right and it constantly smells like gas I wanna fix it but what's my problem?

my 95 z71 gmc 4x4 350 tbi runs great half the time but sometimes when warm it skips and cuts out like its flooded. when shut off or stalls it wont start unles gas is held to floor and once it starts i 4 Answers

i have to hold gas to floor to keep it running it eventually clears out blowing smoke and will run

When my truck sits overnight or for an extended period of time (8 hours), when I start it - it labors and chugs and sounds like its going to die. I give it some gas - once driving it seems fine? 1 Answer

why does my 1999 gmc 1500 new body style and the engine is surging and when its warm and bring it to a idle it still surges. 7 Answers

in the winter my pick up has been doing this for 5 years now. im finally trying figure out what the problem is. when i first start it its really bad. my pick up revs up to 5000 rpm then suddenly dro...