GMC YUKON ENGINE SYMPTOM

My Truck Wont Crank When I Try Un­less I Hold The Key In The On Po­si­tion For At Least 15 Sec­onds. I Re­placed The Starter Re­lay And It Still...

I Just Com­pleted The Re­place­ment Of Both Head Gas­kets And A Valve Job. Af­ter I Fin­ished And Tried To Start The En­gine, It Would Not Start....

Hes­i­tates On Ac­cel­er­a­tion Af­ter Dri­ving For A While. Also At Free­way Speed Go­ing Over Bumps It Hes­i­tates. And Also It Stalls When Turn­ing...

The Ve­hi­cle Was Run­ning Fine But Af­ter A Short Pe­riod Of In­ac­tiv­ity, Now It Won't Start. The En­gine Cranks Over And I Can Smell Fuel...

Seems To Be Worse Un­der One-fourth Tank. Black Smoke When Ac­cel­er­at­ing. Black Car­bon With Mois­ture Com­ing Out Of Tailpipe.

Elec­tri­cal Prob­lem V8 Four Wheel Drive Au­to­matic 140k Miles I Need Some In Depth Tech­ni­cal Help Please - Here's The Long Sad Story...

I Have A 2001 Yukon. Yes­ter­day I Turned Off My Truck, Got Out, And I Re­al­ized The En­gine Was Still Run­ning? I Spent 20 Min­utes Try­ing...

My Suv Started Stalling While Dri­ving It A Cou­ple Months Ago. It Had A Check En­gine Light That Said Mass Air Flow Sen­sor. We Re­placed It. It...

I Have Not Had Any Gas Cap Tight­en­ing Is­sues. I Read Lots Of Posts All Over The In­ter­net That Led Me To Re­place The Evap Valve/​so­le­noid. I...

I Put Diesel Fuel In A Gas En­gine By Mis­take. I've Done Every Pro­to­col Known To Rem­edy. Clean­ing The Tank Clean­ing The Fuel Sys­tem...