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Re: Mom's 91 Astro
Is the mid grade fuel helping any?
if it is, then my first thought is the knock sensor which retards the timing advance when the engine starts pinging.
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'89 Astro 4.3L Z
CFM-Tech power plate
2.5" exhaust, Low restriction cat and muffler
Jet stage I chip
B&M trans cooler
'96 Jeep Cherokee
'99 Chevy Cavalier
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