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How can I fix my car that cannot maintain speed when it reach 2100 RPM.

Tiny
CAPRIRAF
  • MEMBER
  • 1991 MERCURY CAPRI
  • 167,000 MILES
I have to floor the gas to escape the hiccups and then let's say at 70 mph it will start to lose speed. I constantly step on the accelator to keep up with the flow of traffic. Otherwise, if I let the speed to come down, it start********. Beyond 2100 rpm, it is okay.
Please help as I already change mostly everything like Air Mass Flow sensor, spark plugs, wires. Fuel pump, fuel injectors, ignition coil, air filter and fuel filter.
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Thursday, August 25th, 2011 AT 8:40 PM

1 Reply

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Do you have a check engine light?

Could be caused by one of the following below

Oxygen sensor.
Catalytic converter.
Fuel injectors dirty/sticking.
Mass airflow sensor/Airflow meter.
Throttle position sensor.
Crankshaft position sensor
Knock sensor
Manifold absolute pressure sensor.
EGR Valve
Fuel pressure regulator leaking or defective fuel pump.
Fuel contamination.
Foul/defective spark plugs.
Open spark plug wires.
Ignition coil/Coil packs defective.
Incorrect ignition timing.
Cap and rotor.

Note:If it doesn't apply disregard it and keep testing.
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Thursday, August 25th, 2011 AT 8:46 PM

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