If the thermostat is stuck in the open position, there is no way to keep it from staying open except by replacing it.
you might have pulled a vacuum hose off
Year? Replace ECTS and clean the throttle body
bad tps
throttle posistion sensor or vacuum leak
It could be that the thermostat is stuck or that the radiator has trash in it and needs to be flushed correctly. If you flush the radiator go to wal-mart and by hyper cool. this will cool the engine 20 degrees cooler than normal.
sounds like a bad iac motor(idle air control) or vacuum leak
my 1988 4ws Honda prelude idles low at 600 rpm
I had this on my 2000. Check the spark plug wires. I installed new ones and it ran like new.
Check your engine thermostat, it maybe stuck open, keeping the engine from dropping off high idle
It is either your water pump or your thermostat
You might check to make sure that the choke is not staying partially closed. That will cause these symptoms. Also, make sure you have a clean air filter.
Throttle cable may possibly have an obstruction.