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surging idle

  1. 5.0L Tech
    The block is an iron block from an 89 mustang 302 stroked to 347 It has JE pistons – no information about them Ford Motorsport GT40X heads ported and polished. Edelbrock Vic Jr. Intake Comp Cams with a custom grind. 544 lift 224 intake duration and 230 exhaust dur. Electromotive electronic...
  2. 5.0L Tech
    I have a 1994 Mustang GT and have had constant issues lately with the rpm's shooting up and down while I'm at idle. They also do this when I am driving on the interstate and it is shifting between 1st and 2nd gear. The car feels like it is having trouble getting enough fuel or air and it shakes...
  3. 5.0L Tech
    i cant seem to set base idle i unplug IAC and the car idles the same 1k rpm it randomly idles normal then at times it idles high 1.1k or 1.2k i just replaced the IAC today i have checked tps its set at 0.94 i did test it seems fine steady drops n inclines i ran codes got code 33 41 91 and i...
  4. 5.0L Tech
    Hi all. I just picked up a 91 gt with a 5 speed. So, when I fire my car up it turns over strong... then dies. However, when I give it gas for a minute it will stay on. In doing this I noticed ttat the rpms go from like 600 to like 4-5000. So basically it goes from no throttle response to 4-5000...
  5. 5.0L Tech
    88 mustang AOD. Starts and idles fine. High idle at initial startup for about 8 seconds, then rests at about 800rpm. A little bit rough idle in park but once you put the car in drive or reverse, it dies. Sometimes there is a bit of a surge, sometimes its just like somebody turned the key...
  6. Introductions
    1993 ford Mustang GT OK guys i am just about to be finished restoring my 5.0 and then i ran into one last problem. My car is surging during idle from 900 to 600 making the idle very rough. It also hesitates when acceleration almost like its not getting spark or similar to a misfire. The car used...
  7. 2005-2010 Mustang GT Tech
    So today I installed a CAI and a throttle body spacer on my s197. Installation went smoothly until I tried to pull the wiring harness off of the throttle body motor (TBS?), one of the clips inside had broken off and I didn't realize until reinstallation. I zip tied it on until I could get to...
  8. 5.0L Tech
    Ok so were stumped. I just did a GT40P swap. Includes heads upper and lower intakes and threw an e cam in there. Planned on throwing some power adders on there soon, so we planned on 24lbs injectors w the matching maf. Well what we ended up with were injectors out of a 2004 Mach 1, which are...
  9. 2.3L Tech
    i started this thread on modded mustangs, but wasn't getting much help so I am pasting it here: Hi, I have a 1993 2.3L Mustang that is having some behavioral "issues" and I am having a hard time self Diagnosing, so I decided to see if anyone can help. Basically... as soon as I start the car...
  10. 5.0L Tech
    Hey guys. I recently finished a 306 build and put 1000 easy driven miles on it with a oil change. Last night while driving at about 35 mph on 4th gear it started bucking slightly. I put it in neutral and the rpm hung for a second,then dropped a little, blipped itself, dropped a little more...
  11. 5.0L Tech
    My car is a project car first. The car ran fine when I parked it about a month ago. Now I start it and it will surge badly and then shut off, runs rich, and will not accelerate quickly, slow steady acceleration until about 3k then pops and sounds like it is missing. Changed FP regulator and no...
  12. 5.0L Tech
    I have a 1986 EFI 5.0 HO which has a rough surging idle. When the car was given to me i replaced the ignition switch because the car would not stay on unless i pressed on the gas. Then i replaced the spark plugs and the coil and it ran a little better. But the idle speed drops really low every...
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