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Unfortunately it doesn't just happen when I press the brakes

Sounds to me like a vacuum problem.
check the line the runs from your booster to your intake. A way that worked for me to find vacuum leaks is to take a propane torch and turn it on BUT NOT LIGHT IT and run it around all your vacuum lines with the truck idleing. If the engine revs in a certain area you found your leak.
good luck

erick

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check to see if you low on coolant or burp it if you have air in the system it will cause this

I second this.

Last edited by dewmtndew; 12/09/05 02:15 AM.
85 Pickup
33s, lift, EB cam, header, exhaust...