Start by checking the cold start valve. This valve (actually an injector in the intake) adds additional fuel to engine during cranking. If malfunctioning it can cause long starts, or bucking.
Start by disconnecting the connector, if you notice any change, then use a noid light to see if it is getting power during cranking (it is only active during cranking).
Also check fuel pressure regulator for the presence of gas in vacuum line.
If problem persists, check fuel pressure with a mechanical gauge. With gauge attached to test port, turn ign. To ON and fuel pressure should go up to 40-45psi and hold that pressure for a couple minutes, if it goes down quickly, then FPR or a leaking injector.
Wednesday, May 20th, 2020 AT 12:42 PM