i have a 92 loyale ea82 spfi, all stock. 4wd, it runs good no problems in acceleration, the problem is it drops in rpm randomly. id dosnt feel like an ignition problem, it kinda lopes, like your shutting off the engine for a half second, i have a new battery , good alternator, i just changed the engine out, so i cleaned all the grounds, ive had 2300 miles since the engine change no problem, the engine came out of my ole trusty rust bucket never gave me any problems, untill snow flys, arrgg

i just warmed it up and drove it. is hasatates not just at idle, but under acceleration and maintaining speed at 55 mph. its not like the typical surging or loping that the loyale s have, this is different

new update, it runs perfect when its cold. untill the regular idle speed is reached. then lopes at idle and on throttle

Is the CEL on? It sounds like it could be the coolant temp sensor.

check the timing belts? could have stripped teeth, and it cant hurt to look

the cel did blink, but isnt constant. ill replace the coolant sensor whit a good one , thanks all. oh and i just did a re seal and all new timing belts idlers etc.