Are you sure the wiring has been reinstalled correctly. Do you have the injector harness on correctly, no crossed wiring? Are the ground strapes on the back of the head in place and clean and tight? Do you have good fuel pressure? Just looking at the fuel lines and seeing fuel flow out of them is not good enough. You should have 48-55 psi. Hook up a gage and check it. If your fuel pressure checks good, find some noid lights and check the wiring to the injectors. The light should flash each time the PCM fires the injector. If the car was running fine before the repairs, most likly something was overlooked during the repairs. Recheck your work first before jumping to other things.
Imperial Blue Metallic/2SS/M6
In My Hands: 12 November 2009
2004 Joe Gibbs Silverado
2000 Pontiac T/A (RIP) 1 November 2009