99 Malibu hard start and rough idle
#1
99 Malibu hard start and rough idle
I got two problems that may or may not be related. If the car sits for more than 10 minutes than it has a hard time starting. I can turn it off and on and it starts right up. Next probelm is rough idle when in gear. If i shift to neutral it runs smooth. Runs normal when accelerated and my mpg are normal. Recently replaced plugs and wires and fuel pressure regulator.
#2
CF Monarch
The hard starting is probably the check valve in the fuel pump is bad. It takes a while to build up pressure when the fuel in the line drains back into the tank when the pump is not running. The rough idle may also be caused by a slightly weak fuel pump.
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