vintagephilg
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- Aug 20, 2009
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I have a 1999 GMC Siera 1500 extra cab, with the 5.3 V-8. It bogs or hesitates (almost like not getting gas??) when you give it med.-to full throttle...but runs great at small to partial throttle openings, if you accelerate relatvelly slowlly (I was doing 70-80 on the highway no problem....I just changed the oil and installed a brand new AC Deco Fuel Filter (it looked very old and the gas that came out of looked really dirty/nasty..) and I even ran a bottle of Chevron Techron fuel injector cleaner in it... Any clue to what the problem might be or what I can do to fix it??