Have been working on my truck for 3-4 months now, bought the 1994 GMC Sierra K1500 XC 5.7L TBI for just under $3000, so far I've replaced the clutch, spark plugs, and oil. next on the list I think should be clutch slave cylinder, brakes, exhaust and air filter. the truck actually runs great, especially with an odometer over 200,000 miles, but I would like to tune it so it runs better than when it was new.