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If you highlight the text you wish to quote and click the + quote button in the bottom right corner it will quote that message."My guess is the timing chain has alot of slack in it retarding the cam timing and possibly ignition timing of it has not been checked. TBI base gaskets also fail, causing a vacuum leak which effects the MAP sensor and fuel delivery."
I timed the motor when i did a tune up soon after i got it. But I don't doubt the timing chain is worn. I will ck the tbi gasket but it was replaced when I rebuilt the tbi.
"really hilly ou there or what ? i average 15 city 17-18 highway"
Flat here, on the Georgia coast.
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My 95 K1500 305 w/ 3.42s got 16mpg city and 23 highway. I'd say you need a tune up, and clean up the tbi. I would plan on a full distributor and timing chain kit.