I think that your Sniper system is working fine but would definitely check ouf the fuel pump. If you datalog the Sniper ECU and see multiple overlapping traces for the same signal, you likely have RF-induced problems. Hang in there--you can do it. Cheers Darren. Data logs show no EMI/RFI. Coming home from work today it was much warmer and took a little longer due to traffic. :-). It is temperature dependent but 30 is commonly where you find it. Getting the throttle blades and IAC to work together will keep your fuel injected hot rod running smooth and predictable. I've helped folks work through a number of challenges with their Sniper EFI System installations. But I am having troubles.When stepping on the accelerator slightly with idling, it will be 2000 RPM all the time. I am new to the EFI scene but want to learn. Seems like its too slow to grab idle when ac kicks on. Tuning > Advanced > Adv Idle > IAC Startup Holley EFI Electronic Fuel Pressure Gauge, article on choosing between Sniper and Terminator X throttle body solutions. Thanks for your very detailed question! Capability Range: Professional This is a mighty big subject for a blog post reply, I should probably start doing some videos on this. It will need to see it again and again. Don't be surprised if one or the other is slightly open. 30 minutes later CTS reads 161, start engine Idle is jumping from 450 (almost stall) to 1500, IAC is jumping all over 10 90. No matter what do, my idle will not drop below 1350-1400 RPM when the engine warms. No problems with either cold or hot starts. After a complete cool down it will do the same thing. If it does then you can put on a heavier spring so the advance doesn't come in as fast, or use a lighter weight. Once you so this, and after you have your CAN-to-USB harness attached to your laptop with the Sniper software, you can see precisely the cells where the system is operating when the bog occurs. Cycling the power to the Sniper EFI would cure the problem, but not prevent it from coming back. You might have a bad O2 sensor, really bad exhaust leak or a problem with the ECU. Realize that when you drop the throttle, the engine enters a condition it will only see for a fraction of a second at a time. The RPM would increase for no reason. Could be a bad IAC motor, replace it and see if that solves the problem. An under-sized filter will allow part- throttle operation but fuel pressure will drop at WOT and run very lean - perhaps surge under power. I am having an issue with the IAC on the Sniper. Consider adding fuel in the AE vs TPS and/or AE vs MAP ROC tables in the area where the stumble is occuring.Since this is happening at such low TPS levels it is possible that your engine would prefer a lower (richer) target AFR number at idle. Shut off car/restart and it's back to idle at Sniper EFI Tuning & Tech. Then it started behaving oddly.