My 1999 GMC Sierra Classic usto run on e10 but now when I put it in, It doesn’t want to start and bucks when I use e10, so now I have to use unleaded, what is wrong with it?

My 1999 GMC Sierra Classic usto run on e10 but now when I put it in, It doesn’t want to start and bucks when I use e10, so now I have to use unleaded, what is wrong with it? 1 Answer

My 1998 Sierra truck starts finemost of the time, but randomly when I try to start it it turns over and ignights and then immediatly dies. 2 Answers

I have changed cam sensor and distributor cap to no avail. there are no codes that come up when this happens and when I left it at my mechanic for a week it happened 2 times for him but randomly it w...

I have a 1989 GMC Sierra 2500. within the past few weeks, my heater has started blowing cold air. But, it doesn't constantly blow cold air. It goes back and forth between hot and cold. Does this mean my heater core is bad, or may it be another problem? 3 Answers

I have a 1989 GMC Sierra 2500. within the past few weeks, my heater has started blowing cold air. But, it doesn't constantly blow cold air. It goes back and forth between hot and cold. Does this mean ...

My 94 gmc Sierra 2500 lost power recently and now has a weird whistle sound coming from the engine, but only when I'm in drive driving. It almost sounds like a turbo winding up. My truck don't have 1. 3 Answers

The engine is a v8 5.7L 350.

My 97 2500 gmc with a 350 in it the feul pump went bad I changed it and the truck fires but won't start help please 4 Answers

I tried to bleed the system but that did not help I am getting spark but I don't think the fuel is getting enough pressure