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Re: '88 5.7 TBI .. the TPS ???
I think it's the later years the TPS was made non-adjustable but you can slot the holes for adjustment. Small files and a Dremel rotary tool are some of the most useful tools I own. I really couldn't tell if mine is adj. by looking at it since it's kind of buried but I remember I have adjusted it long ago.
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1989 K1500 Chev. EC
Original owner; some of the aftermarket parts I've installed are Borla headers, Hypertech chip, Edelbrock water pump, and a Stillen rear disc brake conversion kit.
2009 Hummer H3T 3.7L 5M (sold)
1997 K2500 Chev. EC 7.4L/ 4L80E
2018 Dodge Ram 2500 HD R/C
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