k now i drive a 90tpi coup, the problem is sometimes under big load it just loses power it still gos but not like it should.I got a pressur cheek today and it was at 38psi but while it was on we couldnt get the problem to happen, so can a fule pump work sometimes but after a bit can it losse pressur, but today when i left the shop it happen i trun the key off while going 60mph and back on and it stop.the car has 134,000miles on it the fule filter just chang that out. is it the fule pump, fule pump reulater, or a relay or what please helpme!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!:banghead :

Some PUNCUTATION would make it easier to work out what you are saying.

I got a pressur cheek today and it was at 38psi
Should be 43psi with vac hose off

i trun the key off while going 60mph and back on and it stop.
Why would you turn key off while driving?

is it the fule pump, fule pump reulater, or a relay or what please
Could be any or all of them .Pump could be weak or not getting 12V.Only way is to test fuel pressure while driving
Could be faulty injectors also.

Have you got any codes showing?

:goodpost: Lets start with getting that info if there are codes!:thumbsup:

I usually go to like autozone or somewhere they let you use the code pullers so you can see your codes and then I start asking questions!

thanks guys i just put in a new fuel pump and hopfully it fixes my problem i think it will..i will keep u guys posted. thanks