GMC SIERRA ENGINE

What Is A Powertrain Control Module

I Have A 1500hd W/ 6.0l. What Would Cause My Mileage To Drop To 8.5-9 Mpg From 10.5-11? I Changed The Plugs, And Went To Synthetic Oil...

I Haven't Changed My Plugs In Over 30,000 Miles But Everything Seems Fine. I Just Want This Truck To Keep Running Good.

Codes 24 And 42

Truck Starts Fine When Cold, Difficult Starting After It Is Turned Off After It Is Warmed Up. 1999 Gmc Sierra 4.8l Engine. Bought The Truck...

I Can't Figure Out Why. I Have Replaced The Thermostat, Water Pump, And Hoses. I Tore Down The Motor And Flushed It Out I Have Also...

I Was Driving My Truck At About 55 Mph. Truck Had A Hesitation Like A Plug Wire Was Pulled, Then Started Running With A Bad Miss Like One...

Only When Driving Between 15 Mph And 30 Mph When I Push On The Gas I Hear A Slight Bird Chirp As It Engages Into Gear But That’s The Only...

The Truck Will Start But Idols Too High. After It Warms Up It Floods And Won't Start Again Unless The Gas Pedel Is To The Floor. It Quits...

I Need To Change Out My 'crankshaft Position Sensor' And I Hear That This Particular One Is A 'bear' To Remove? Can You...