Fortunately, these are much easier to solve. My guess is a faulty IAC since it is intermittent and I have not done any setup changes. Your suggestion to remove the PCV valve is just for diagnosis purposes, right? I installed Holley Sniper on three other Mavericks here in Brazil and the problem also exists.I did not make any changes to the parameters, only on Target AFR and the correction on the Idle Speed Curve chart. First, let me congratulate you on your patience in letting the system learn. After doing TPS reset it starts fine but when you give it some gas it hangs at 1500 and will not return to idle. Holley Sniper EFI Problems: Best Fixes According to Manufacturer Remove the tape from the IAC breather hole and restart the engine. If you did not rotate the distributor to set the actual timing to 15 that might be the only issue. Hi I wish I had bought from you but I didn't find this site until now. Running new vintage air system so the is only a single power wire to compressor thats why I asked if I needed to run input wire to ac relay or if iac would pick it up fast enough(which its not). At this time, TPS is 0%, IAC is 50 to 60%. I asked him a million questions and waited a long time to save up before purchasing the system and I have asked a lot of questions throughout the installation process. I have been reading these posts and have learned a lot. If you suspect this then try to find a situation where this occurs where you can safely check the secondary throttle shaft and see if i's slightly open. The tps will not auto reset to zero. If the TPS is even just 2%, the IAC will go to the hold position (normally 30%) and will not change until the TPS goes back below 2%.If you create a datalog you will be better able to confirm if something is not working correctly. That could be a problem with the TPS or it could be some sort of throttle linkage issue. (I'm running from a fuel cell on the garage floor 10 feet away with lines in plain sight and do see fuel coming from the return at a decent flow. The next time it happens is the perfect opportunity to find the problem. Chris thank you for the info. With the vehicle in neutral, adjust the idle screw until the IAC Position reads between 2 and 10%. Unfortunately I did not buy my sniper efi from you. Wish I had bought my sniper from you, but unfortunately didnt. You'll have to go back and forth a couple of times to get it just right. Commanding the engine to automatically increase speed when switching into drive is a little scary to me though. After a complete cool down it will do the same thing.
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