surging idle

SURGING IDLE / NO IDLE CHECKLIST FOR 1999–2004 MUSTANG GT (4.6L 2V) This is a work in progress. Please run this checklist when it is applicable to you and provide feedback to help improve it. Feel free to comment with corrections or suggestions or diagrams or pinouts that you think might be...

This is a work in progress. Please run this checklist when it is applicable to you and provide feedback to help improve it. Feel free to comment with corrections or suggestions or diagrams or pinouts that you think might be useful. SURGING IDLE / NO IDLE CHECKLIST FOR 1996–1998 MUSTANG GT...

I am at my wits end, I have replaced near every sensor I can think of on my motor (‘89 5.0) and yet everytime I have to start the car cold it revs up and dies. It will restart immediately and then struggle for a few seconds before dying. Once it finally finds its idle and goes into gear (AOD) it...

Few months ago I installed a mspnp2, along with GT40P heads and intake on my 95gt, idling has always been an issue but the startup creeps to around 3k and hangs there for 4-5 seconds before dropping down, this is only when the car has ran in the last couple hours, cold starts in the morning...

When I start the car, it surges on high idle only. Normal idle and driving is fine. Its a 1986 with a carb set up. Any ideas why it might be surging? I checked for vacuum leaks but couldn't find any issues. I've adjusted my carb and timing where it runs the best. Bad idle circuit maybe?

I have a 95 mustang gt 5.0 with stock bottom end, gt40p heads 1.6 roller rockers, comp xe264hr cam, 75mm throttle body, 30 lb injectors, MAF calibrated for the injectors, BBK cold air intake, Trick flow upper and lower, pacesetter long tube headers, custom 3” exhaust, no o2s (yet, bought without...

Started as a surging idle when the engine warmed up then after a year the idle rose to 2500-3000 rpm I replaced the IAC and now the idle is poor and the car stalls and check engine light is coming on. Thinking about tps next unless anyone can think of something else. I have never had any other...

I have a 1990 GT convertible and the idle was surging after a few minutes of running so I did some research and replaced the IAC valve and when I started the car it ran great for about 10 minutes then it started to surge again so I replaced the TPS sensor as well and adjusted it to about .96 and...

Fellas, I've been chasing a No Spark/Surging Idle/Stall, Buck, Backfire problem for quite some time now. I have worked though most of the tech notes I've found on the online, studied the systems using the Helm manuals, as well as the diagrams by jrichker, tmoss & joel5.0, and Tom Cloud's...