Question about Mercury Cougar

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Why is my 2000 mercy cougar misfiring on cycliner 1. I changed almost everything under the hood and its still running really bad. I had got bad gas about a month ago and then thats when i notice it started running bad.

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Have you checked all vacuum hoses and pcv
hose for leaks ?

Do the spark plugs have more than 3 years or 70,000 miles
Did you change the front 2 -- O2 Sensors at 100,000 miles
Clean the MAF Sensor

Smoke test the intake for leaks

Smoke the EVAP System

Posted on Mar 19, 2011


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I have a 97 merc cougar xr7 4.6 v8 I had a weird vibrating hesitation while accelerating thru the gears. It feels like it's almost running on 7 cylinders. I opened the hood and manually reved the engine...

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But if it were my car I would fill it up with chevron 91 and add two bottles of techron cleaner. At 1/2 a tank fill it up again run the remaining fuel to low and then hope it cleared up.
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I had the same kind of problem and I ended up solving it by actually checking for recalls for the 2000 Cougar and when you do, you'll see that there is a fuel pump recall. I dont' know if you've already done this but I figured i'd post this and try and help out!

Much luck

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