rollnhrd

What cause the engine to idle up and down with in 200 or 300 rpms? While just floating.. any info would be great. Thanks mike

Ntrsspray

Blowers?

MikeyFIN

most likely a vacuum leak...

anewway

iTrader: (1)

Possible Idle Air Control (IAC) valve defective

MikeyFIN

If we just knew what engine.... Carb or injection...IAC's are PITA's sometimes.. so are vacuum leaks... if a carbed engine the leak can be in the carb too... a real PITA to find out.

rw40426

Mine did that when I had a jacked up map sensor on it. 525

rollnhrd

its a 525 blower with 2 800s on it

FIXX

iTrader: (2)

its called blower surge,,normal if you have alot of boost

Expensive Date

Yup and it sounds cool leave it alone.

Griff

The surge is caused by each revolution of the blower. Sometimes it can be reduced or eliminated with carb air bleed adjustments.