[90MustangLX2.3L]

I just had me transmission serviced (front main seal) and now my idle is bad. The car will shake from 0-25 mph. New IAC, EGR, O2 sensor. The exhaust is a little loose but I don't think it would effect it much. The engine never reaches a normal operating temperature either. No trouble codes. Any help would be great.

[C J]

is the connection to the manifold loose?? if so, tighten up the exhaust...an exhaust leak there can cause an O2 to read incorrectly.

does the engine have an thermostat in it?? are you checking the engine temp with the stock gauge or aftermarket gauge??

[90MustangLX2.3L]

Yes the connection there is loose. I don't have an oxyacetylene torch so I can't really tighten it up. I don't really feel like breaking the studs. I'm not sure if there is a thermostat in there right now. I wouldn't be surprised if there wasn't. I'm reading it from the factory gauge. The guy that owned the car before me was an idiot when it came to fixing a car.

[sleeper_inc]

I have yet to snap my manifold bolts, just shoot some PB blaster at it and let it sit over night, then carfuly loosen them or tighten them (what ever you want)

Get a thermostat in that car, it makes it get better MPG