Help with random rough idle

[94 Mustang Steve]

Purchased a 94 GT with a 70mm throttle body, inner fender cold air intake and full Magnaflow exhaust system. Have done a full tune up including new ignition module, msd cap, coil, wires and plugs. Normally runs great but sometimes has a bit of rough idle and even once in a while idles so low it cuts off but always starts right back up.Wondering if I need to upgrade the original 19# injectors for 24’s? Does also have 3:73 gears and a mild shift kit. Any help appreciated!!

 

[General karthief]

you need to check for codes and get it running right before you start adding stuff and make the problem harder to fix.

 

[94 Mustang Steve]

Well the weird thing is the check engine light used to be on even after I did the initial tune up but then went off after replacing the ignition module and hasn’t come back on since and that was about a month ago

 

[General karthief]

There will be stored codes, if you want to start fresh check the codes and then reset the computer by disconnecting the battery for a few minutes with the headlights turned on to use up any residual voltage the turn the lights off hookup the battery and drive the car around for while then check for codes again, make notes of what codes you get.

 

[94 Mustang Steve]

There will be stored codes, if you want to start fresh check the codes and then reset the computer by disconnecting the battery for a few minutes with the headlights turned on to use up any residual voltage the turn the lights off hookup the battery and drive the car around for while then check for codes again, make notes of what codes you get.

Ma

 

[94 Mustang Steve]

Makes sense, I’ll try that and let u know how it goes. Thank you!!