OK GUYS I HAVE A 1990 MIATA, AND LATELY I HAVE A PROBLEM TO START THE CAR ON THE MORNINGS, WHEN I START IT AT MORNING THE RPMS ARE LIKE ABOUT 500 AND IF I PUSH THE GAS THE ENGINE DIES ON ME IT JUST WONT RUN THEN I HAVE TO WAIT LIKE 1 MIN OR SO TO RESTART IT AGAIN AND, AFTER THIS IT TAKES LIKE 2 TO 3 MIN FOR THE ENGING TO STAR RUNING OK, WHEN I STAR DRIVEING THE CAR HAS NOT POWER AT ALL I HAVE TO REV THE ENGINE AT 3000 TO 3500 FOR THE CAR TO HARLY MOVE, AFTER 20 TO 30 MIN OF DRIVEING IT THE RPMS GOES UP TO ARROUND 2000, AND AT THIS TIME THE CAR HAS PLENTY OF POWER AND RUNS GREAT, BUT WHEN THE RPMS GOES BAK TO NORMAL, IT LOOSES POWER AGAIN, PLEASE HELP ME WITH SOME ADVICE THIS PROBLEM ITS DRIVEING ME CRAZY.

 

is your engine light on? just a guess it could be the idle air control motor

 

Is it Automatic or 5 speed?

 

when i had a universal intake kit i forgot a hose to the intake and the car would die until it warmed up

 

water in the fuel can cause this.
Bad engine temperature sensor can cause something similar ( the one on the back of the block). But usually causes the check engine light to come on.
Air intake filter need changing?
Good luck