could the upper intake cause this problem? I have checked to see if there are any coolant leaks, but found none

Really need to do some tests and get some numbers. Fuel pressure is a must.

i just replaced the fuel pressure regulator after it has been sitting for 6 hours, it started right away and ran fine for 20 minutes and then the check engine light came on again, i will let it sit for a few minutes and try and start it and see what happens

what type of specific numbers or readings should I get when connecting a fuel pressure gauge to the fuel pressure regulator as the, are engine runs and when I shut off the engine are the readings to remain the same when the engine is on and off?????

something happened to this reply it did not have all of the words that I typed, it looks like some of the words were removed

CEL means codes are stored. What are the codes?

Normally you would connect a fuel pressure gauge to the fuel rail. We'll want to see what pressure it is showing ignition-on engine-off and what pressure it maintains with engine idling.

Here'* what I saw:



Not sure what other words there were supposed to be.

got the fuel pressure gauge hooked up and pressurized the system, got a reading or 17 and one half, started the car and got a reading of 20 PSI, let it run for 5 minutes and shut of the car , watched the gauge and it stayed at 20 PSI for 5 minutes then I unhooked the the gauge,the results with the engine running and off was a steady 20PSI

Is your gauge okay? The pressure should be about 50 to 55 PSI. I wouldn't think it could run at all with it at 20.