Need help, newly swapped 5.0 jerks and bucks

[red390gt]

I just swapped a 5.0 & t5 into my 92 Mustang, it was a 2.3 auto. It runs good but when I'm driving the car when I let off the gas pedal the car starts to jerk and buck back and forth (like I am giving it gas and then quickly letting off again over and over), It's very strange. I can get around the problem by just pushing in the clutch pedal and coasting while slowing down. Anyone have any idea what might cause this? I know it's not a back clutch. I have a feeling it's something to do with surging idle but just a guess.

 

[klapdout]

did you buy new motor mounts for the swap? id start there, if not idk

 

[jrichker]

See the sticky "Help me create the Surging Idle Checklist" at the top of the forum for help with your idle problems. The first most contains all the updates to the fixes. I continue to update it as more people post fixes or ask questions.

 

[Bad92GT]

just sounds liek your not running enough RPM for the gear your in.. if it isnt that.. then its a bad miss probably

 

[red390gt]

did you buy new motor mounts for the swap? id start there, if not idk

Yes I used new engine mounts.

 

[Skoobie]

Yeah I have the same problem. I just either shift to the next lower gear or put the clutch in. If you do find a problem and a fix let me know