Thanks in advance for any advice. I have an EZ EFI 1.0 installed on a 4.0 L Jeep. I have never been able to get the idle to slow down to the selected idle speed. For example, when first installed, it idled at about 1000 rpm instead of 750 rpm, but otherwise ran o.k. Lately, the idle has been climbing and it now bogs with attempted hard acceleration. More information. IAC is showing 5 at idle speed 1200 rpm. If I increase the idle speed on the computer console to 1300 rpm, the IAC starts bouncing and the idle starts bouncing up and down until it stalls. When I run a new "tune", the TPM tuning prompts me to adjust the throttle position to a resultant rpm of 2200 rpm. When I turn the idle speed screw to the slowest setting, I am at 1200 rpm (IAC 5). So far, I have not found a vaccuum leak. What do I do next? Try plugging the IAC? Disconnect the O2 monitor. Check the throttle blades? Look some more for a vacuum leak? Check the wiring for "interference". Thanks for any advice on what to do next.