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Im getting a 1995 Chevy K1500 Z71 with a V6. Its Automatic. Its a Short Box. When we test drove it it felt sluggish. It would get up to speed but it took a while longer then usual. What could the problem be if there is even one? I think its because its a big truck with a small engine.
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Okay, the little bells in the back of my head are going DING,DING,DING! A Z71 with a V6 isn't unheard of, but do yourself a favor, and pop open the glovebox, and look at the Service Parts Identification sticker. The RPO codes you're looking for are Z71(Chassis package: Offroad) , and G80(Limited Slip Differential)[READ-POSI REAR]. Anybody can slap a pair of Z71 decals on the fenders. Now, is it 2WD or 4WD? This may affect your bargaining posture if it is not actually a Z71. Is it a private sale, or a car lot?
Three things which come to mind are the gas filter, air filter, and the transmission filter. I would change them all as a matter of course when picking up a used vehicle.
While it may have a lot less top end, and certainly won't be able to tow as well as a V8, it shouldn't be "sluggish" off the line. Perhaps you are accustomed to driving pickups with large V8s?
There are 3 main ways to use seafoam that will help clean your engine out and possibly (and probably) give you some performance back. All 3 are outlined on the back of the can.
The ways are:
In the crank case (in the oil, use for about 500 miles then change the oil)
Through a vacuum line that goes straight into the intake manifold. (Typically through a brake booster or pcv valve)
In your gas tank.
As I mentioned, all of these uses are outlined on the back of the can with pretty detailed instructions. Seafoam is a fantastic product.