[dnult]

Sounds like the computer has lost track of the amount of air being drawn into the engine. A big vacuum leak can cause this. Did the power brake boost host come loose or other manifold vacuum hose / fitting? Check the Mass Air Flow (MAF) sensor and wiring. Did you have to disconnect it to get the air-cleaner installed? Did the tab break loose on the connector and wiggle loose? Throttle position sensor may also be at fault. Is their a check engine light on? Around here, autozone will do a free OBDII diagnostic check. Good news about OBDII is that the codes are generally accurrate compared to earlier ECMs. Throttle position sensor may be faulty. See if you can obtain a service manual which explains a basic troubleshooting procedures you can do with a Digital Volt Meter to save you shot-gunning with expensive parts.

-dnult