So I have just changed the crankshaft positioning sensor and timing belt on theach car. So the car started fine but was idling pretty bad. So I got a can of parts and carb/choke cleaner and cleaned out the IAC valve and throttle body. Now the car won't start. Should I change the coils? The car hastarted 255xxx miles on it.. :/

 

after using the carb/choke cleaner, you should check/replace the spark plugs.

 

Is your CEL illuminated?
Also, verify mechanical timing.