not starting correctly

[black97sts]

I have a 97 sts and it is not starting correctly. Basically when the car is cold it starts great 1 turn and vroom. but once it gets warm it is harder to start. it takes like twenty cranks to start then it fires ups drops dow to 200 rpm and back up too regular operating rpm..could this be because of the antifreeze i am using or a cts sensor that is about to go bad. the fuel pressure is fine any thoghts please i need some mechanical assistance.

 

[MAC1]

Fuel pressure regulator may be the problem. Hard starting when hot is a symptom of a defective FPR.

 

[black97sts]

thanks

thanks mac that is exactly what the problem was.

 

[97blacksts]

i like your display name. and your year and color choice of your car. hahaha

 

[1998caddysts]

i got a 1998 sls and when it is cold it wont start correctly it like will hit but not start it takes a couple of turns of the key before it will fire and run it i guess coughs a few times help me out thanks