I have a 99 Silverado with a 5.3 thats 4x4 and my wrench friend and I checked the fuel pressure the other day and it's reading between 52 to
58psi. when you first turn the ignition on it jumps up to 58 then falls to a steady 52 psi. with the motor running i get the same 52 psi and if you open the throttle it jumps to 58 again. now after doing some reading around I found out that the pressure is sposed to be this 379-427 kPa (55-62psi). The reason I checked the fuel pressure is because the truck hesitates pretty bad sometimes when you gas it.. just acts like it's not getting the fuel it needs. we thought it might be the regulator, could i have a problem there? the fuel pump is new (10k miles ago) and so is the filter (about 2k miles ago) also got a new air filter and the MAF has been cleaned. I know there are alot of other things that could cause this (injectors, plugs, wires etc.) but I'm trying to narrow them down.. I'm also thinking I have problem with the torque converter because I'm still experiancing the jerky down shirts and take offs..one other thing is the throttle sticks pretty bad sometimes. you have to push it kinda hard to "break it loose" which causes the truck to want to really take off.. except it can't because it's hesitates.
Any input would be greatly appreciated.
Adair