1967 Mustang 5.0 swapped shuddering/sputtering issues

[Cro67]

Hey guys, hope this is the right sub forum (if not please lmk). So car in question is a 1967 Mustang swapped with drivetrain out of a 1990 Mustang GT auto. Car starts right up and idles fine and revs up no problem. But recently just driving around the block it’ll randomly stall when coming to stop signs, attempts/will stall while making turns, under acceleration in a straight line it shudders and sputters momentarily then clears up. If it stalls when doing any of these it will start right back up after cycling key switch. Car does have manual steering/ac. Checked fuel pump/fuses, IAC, grounds for harness, all appears good. TPS voltage is set at 0.98. Honestly not sure where to go from here and any suggestions would be greatly appreciated.

 

[AeroCoupe]

Over the last couple of years we have been seeing two things come up regularly but before we go down rabbit holes have you checked for any codes? If the car was wired up with a check engine light (CEL) it will only illuminate for emissions related codes. However, other codes can be present with no CEL so you need to check for codes.

Electrical Thread 'How To Pull Codes From EEC-IV In 86- 95 5.0 Mustangs'

Jan 27, 2016

@Noobz347 - The code dump procedure isn't in the sticky - you may want to add it...



Dump the codes: Codes may be present even if the Check Engine Light (CEL) isn't on.

Dumping the computer diagnostic codes on 86-95 Mustangs

Revised 26-July-2011. Added need to make sure the clutch is pressed when dumping codes.

Codes may be present even if the check engine light hasn’t come on, so be sure to check for them.

Here's the way to dump the computer codes with only a jumper wire or paper clip and the check engine light, or test light or voltmeter. I’ve used it for...

• jrichker
• Replies: 10
• Forum: Fox 5.0 Mustang Tech

• 

Once you have done this (if you haven’t already) let us know. Even if there are no trouble codes present you should still get an all clear code of 11 when performing the KOEO test. Thread above goes into this.

 

[TTSaleen]

Are you using the factory TFI distributor? I recently had a similar problem and it turned out to be my distributor. I had replaced TFI modules and it got worse. I ended up with a new distributor, remote TFI module, and replaced my coil and resolved my problem in my 87 stang.

 

[General karthief]

Did you do the swap or buy it this way?