i did a fuel pressure test on my 97 f150 4.2 everything is within specs except when i remove the vacume line from the presure regulator the presure didnt increase like the book said it should does this tell me my regulator is bad?

 

Did the line have vacuum on it?
What was the pressure that you were getting?

 

the line had vacum i was getting between 30 and 40 psi

 

It should be about 32 psi with vacuum and 40 or so without.
If it sin't changing and you have a contant 40psi, then I would suspect the regulator. Did any gas come out of the vacuum port on the regulator?

 

no gas came out that i noticed thank you for the response

 

i changed my pressure regulator it fixed the stumble and the hard starts for 1 day now its doint it again sometimes it surges when i take off it acts like it is running out of fuel but it takes off about a secong later

 

Clean the MAF. Also, check the TPS sensor, it could have a bad spot in it.
Jimmy

 

tps is a week old cleaned the maf 2 weeks ago