V-10 gas powered engine surging at hwy speeds gets worse in city driving but idles just fine,getting less than 9 mpg
SOURCE: 1991 Caprice Classic 305 engine surge
Sounds like the throttle position sensor to me. I have a 1991 caprice wagon and I have to replace this part every 6 months or so. It's a cheap easy to replace part, around $25, but I haven't been able to find one that will last like the OEM. It's just a variable resistor that tells the computer where you have the gas pedel. When it fails it tells the computer you're giving it gas when you're not.
SOURCE: '98 S10 4 cyl. 5 speed: Sudden high idle, now surges.
Go to your local shucks or auto zone and they can check any codes behind your check engine light and it's free. It sounds like one of two things a O2 sensor or your mass airflow sensor but they will tell you for sure
SOURCE: 1996 Astro AWD 4.3L V6 308,000Km engine hesitation/surging
tsb remove dist cap ,clean out breather holes i replaced cap and rotor at the same time. chevy has the problem with the 4.3l astro,s and blazer i have both.fixed the problem when buying the cap and rotor the directions inside will also tell you how to fix
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