Hi this is my first post here. I have been having this problem with my Ford for the last two years or so but it has gotten much worse recently.

When my truck idles it does so very erradically usually hovering around 17-1800 RPM and revving up and down wildly. It never goes over 3000 RPM's (yet) but it sometimes stalls. I have been trying to pin this down without success for some time now if any of you can help I would owe you big time.

I unplugged the engine idle control valve and now the truck idles a lot smother but still stalls and idles around 11-1200 RPM. I seem to be losing vacumn in the engine (a guess) as my clutch fades in and out depending on the way the engine is running.

I also thought it could be that the cats are plugged but I am unsure how to check this short of ripping them off. Today my truck is undrivable. It seems to vary a lot depending on the weather, or more specifically, the humidity.

I will appreciate any suggestions you all have as I am at a loss. I am ready to rip the EFI off and throw a Holley on there and say to hell with it all.

Please advise...