Thanks for all the suggestions so far...
Unfortunately, nothing has changed
Checked the fuel pump relay & all good. Just for good measure replaced it, but no difference.
New OEM fuel pump made no difference at all. Checked the electrical connectors when I swapped the pump out. Fairly confident that the new pump is OK (symptoms are identical), but could well be an electrical connection somewhere else in the circuit. Haven't checked the fuel pump driver module & connections yet, so that's probably my next step.
TPS voltage OK, too.
Electrical connections are certainly becoming brittle...or at least some of them are - recently swapped out my headlight bulbs & the connector clips just fell apart.
To try & provide more information this intermittent hesitation seems to typically occurs when under part throttle cruising at 60/65 on the highway or under part throttle on other roads (say when gently driving at 25 in subdivisions). When accelerating this doesn't happen. Timing can be anything...might be 40 minutes after starting to drive or maybe only 10 minutes. Sometimes it doesn't do this for a couple of weeks, or it can be multiple times in a day.
Since I'm still at the trial & error stage with no check engine light, no codes, & an intermittent issue, thought that maybe the throttle could be the problem (with 160K now on the car, maybe the switch is worn), but since this also happens using cruise control, seems that would rule the pedal out).
Kinda given up driving my Mustang over the last year or so as a daily (due to this) & only taking it out after checking/replacing something, but with the summer rapidly approaching it would be nice to be able to get this sorted
Thanks in advance for any further help/suggestions!
2006 Mustang GT Convertible
2004 GT hood scoop, LeMans stripes, K & N, sequentials, strut brace, underhood & interior billet, tinted lights, custom paint, & lots of miles.
It's my daily - wind, rain, snow, sun - seen them all!