So, I'm not sure I completely understand the issue. Is the gauge just giving a weird erratic reading and the engine maintains smooth idle, or is the gauge matching an erratic idle?

 

Do any of the other readings on the handheld match the erratic idle? Is it doing it at a certain temperature?

 

When this is going on, sometimes I would hear the fuel gushing through the TB like it does at first startup. I normally don't hear the fuel going through the TB other than at first startup. Also the car would surge because of the RPM increase and the AFR jumps too. Don't notice any difference in cold or warm engine.

So it was bothering me and I just wanted to make sure there weren't any obvious vacuum leaks. Checked the hose for the ported vacuum advanced and looked fine. The hose for the PCV looked fine too. When I went to the passenger side and took the cap off for the manifold vacuum and noticed few drops of fuel dripped out but the cap looked fine. Then I took the cap for the other PCV port next to it and few drops of fuel dripped out and the cap looked fine too. Checked all the other hoses and they were still like new since I replaced them about 5 months ago when I installed the FiTech unit. Does it sound weird to have fuel coming out of these 2 ports?

Thanks!

 

Was on the phone with the FiTech tech this morning and we tried to adjust the system and get the IAC numbers to where it should be and would not budge. Cody, the tech and probably owner said I have a small leak somewhere and to cap off all of the ports on the FiTech unit to see if the numbers will react to the adjustments. I'll probably cap off the vacuum tree on the manifold for the brake booster and other items too to see if any of those are the culprit. Did act like a vacuum leak but I couldn't find it before but now I have a FiTech tech telling me the same thing so that's my next project, to check for vacuum leaks.

 

For what it's worth an unlit propane torch is very helpful when trying to find a vacuum leak. It helps if you can get a hose over the end of the torch and have a small diameter tube on the other end, you can then position the propane along gaskets and seals where the leack may be.

 

Thanks for the suggestion. Might be able to find it with an upside down can air but have to pinpoint which port is the culprit first and then check the hose or replace the hose. Here's a video of what I'm talking about in case others are in the same boat. Replied to a post earlier today where the person had a similar issue.

https://youtu.be/mVhwpK3iPjM