surging rpm Options

[Joe_1985]

well i just noticed this tonight, after i drove my 25 mile drive home and parked in my driveway, I noticed that my rpm would float between 1000 and 700 very slowly.

so i got out and stood behind my car and listed to the exaust (its stock) and id hear the rpms slowly go down to about 700ish rpm , sputtering missfire, then jump back up to 1000ish, sit for a second or 2 then slowly fall sputtering missfire, then repeat.


when i got the car i changed the cap, plugs, wires, rotor button, cleaned out the intake manifold, and throttle body.

ill check the plugs in the morning.

it also surges up and down the rpm range if i hold the gas steady, does the same thing falls very slowly then goes back up.

btw this is a 7afe with 189,000 miles on it

[Mstoochn]

well i just noticed this tonight, after i drove my 25 mile drive home and parked in my driveway, I noticed that my rpm would float between 1000 and 700 very slowly.

so i got out and stood behind my car and listed to the exaust (its stock) and id hear the rpms slowly go down to about 700ish rpm , sputtering missfire, then jump back up to 1000ish, sit for a second or 2 then slowly fall sputtering missfire, then repeat.


when i got the car i changed the cap, plugs, wires, rotor button, cleaned out the intake manifold, and throttle body.

ill check the plugs in the morning.

it also surges up and down the rpm range if i hold the gas steady, does the same thing falls very slowly then goes back up.

btw this is a 7afe with 189,000 miles on it

vac leak in the brake booster, shine a light into the plug wells, see if any of the spark plugs are wet. (oil leak)