Hello all I'm new here. I've been having trouble with my 09 f150 stx 2wd. I have been getting a flashing check engine light and loss of power especially when pulling a trailer up a hill. I've been told this is a cylinder miss. I've replaced all coils and plugs as suggested by my mechanic with no result. I finally got a fuel pressure gauge and my book says I should have 55 to 60 psi at idle. I measured 50. I have 130 k . Could the fuel pump be the issue ?
thanks for any response.
dave

 

You need to read out the codes.

 

It is a misfire on cylinder one. I was told this by dealership, my mechanic, and oreilys.

 

If the plug and coil are known good, I'd suspect a bad injector.

 

Thank you for that answer. That is what I was thinking. I was just wondering if that fuel pressure was to low. I will be replacing that injector soon. I appreciate your response 😊.