A bit of background, have a 91 f150 with 5.0 auto with 134K miles. I have had the truck a year and a half. Done some work on it, replaced the starter, alt. radiator, hoses, thermostat, belt. Runs pretty good, mileage from 14 - 17. Now when I am cruising in town at about 30 with the throttle slightly depressed the truck will lurch a bit, maybe like it misses but I give it a little more throttle and she runs smooth. I replaced the TPS in the past. What is next? there is no check engine light on.

 

Pull the codes. The engine light doesn't have to be on to set a code.