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92gmc · 04-21-2017, 07:02 PM

The PCM is the computer in the truck that controls the engine and other things. There are a number of folks that do "Super Tunes" and yes it can enhance the performance - usually with a reduction in mileage.

04-21-2017, 07:02 PM	#2
92gmc Registered User Join Date: Jul 2007 Location: Dunnellon, FL Posts: 113	Re: Pcm ?? The PCM is the computer in the truck that controls the engine and other things. There are a number of folks that do "Super Tunes" and yes it can enhance the performance - usually with a reduction in mileage.