Misfires, spudders, wants to die!!!!!

Asked by Jan 08, 2015 at 11:09 AM about the 2000 Mercury Cougar 2 Dr V6 Hatchback

Question type: Maintenance & Repair

When it's cold outside car revs up
and down, wants to die. When I'm
over 2000 rpms it's fine. When I
proceed to brake the car wants to
die but still go and brake pedal feels
like I'm pressing on a brick. I've
changed coil pak, spark plugs and
wires, egr silenoid, egr valve, fuel
filter. Idk wht else it could be, when
it's warm outside cars does it also
but when motor is warmed at temp it
runs fine and brakes work fine, but
anything under 50 degrees outside
car runs like shit. It's the 2.5liter v6
motor

5 Answers

225

You might want to have your cooling thermostat checked, some cars, for example the 2005 V6 has a safety feature for when the car runs hot. It will alternate cycl causing that sputter to happen in order to help the engine cool by allowing more airflow in, and it can feels like it wants to die, but it is a built in safety feature.

225

My 2005 V6 mustang did this and it was a cracked thermostat.

Ok but wouldn't that make the motor over heat if the thermostat is bad

And I got a new thermostat about 2- 3 yrs ago when it started to over heat I changed that and come to find out it was the water pump belt.

75

Sounds like an O2 sensor.

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