'94 Grand Cherokee gets fuel pressure during the first
2 seconds. But loses that pressure almost immediately afterwards. Have replaced the fuel pump and the fuel pressure regulator. None of the fuel injectors appear to be leaking.Where might the loss of fuel pressure occur?
The Grand Cherokee also misfires above 2000 RMP. This happens only with transmission in Park or Neutral, not in drive. It idles well and runs well up to 2000 RMP. At 2000 RMP and above get misfires as evidenced by roughness and high HC's. Misfiring is not isolated to just one cylinder.
Have replaced the crankshaft position sensor (which was bad). Have replaced the coil, the cap and the rotor. Inspected spark plugs and they look new. Checked spark plug wires and they are good.
What might cause misfires only above 2000 RMP and only in Park or Neutral?