Woooo! Figured it out. Timing was off---by a lot! Thanks previous owner for installing the new belt wrong. She is running perfect

Thanks for the response. I thouroughly cleaned the iac and i feel ive really rulled out vaccum leaks. At a lost, but i agree it does seem like a classic vacuum leak. :/

Hi All, I'm new here and am in need of some help. I recently purchased a 1996 Volvo 850 GLT with 195,000 mi. I have a random misfire code P0300 and a missfire on all cylinders (codes p0301-p0305) only at idle. If I reset the engine light on the hwy I can drive for hours without a problem and it runs...