Hello,

I am having trouble with idling malfunction.
I have replaced many parts.

Spider injectors, IAC, EGR, distributor, ICM,fuel pump, fuel filter, fuel tank, spark plug, plug wire intake no fuel leak, new ecm
No fuel leak in upper intake　Fuel pressure is about 58 to 62 psi
From 62psi on key on to 25psi immediately then slowly to 0.　Is this normal?


Please give me your wisdom.

thanks

 

You need to identify the cause for the fuel pressure leak down. Look at the sticky on testing fuel pressure and get the leak down reading at the fuel filter. This tells us if the problem is in the tank or at the engine.

George