Engine problem on Mercury Cougar

Average mileage: 156,000 (156,000–156,000)
Engine affected: 3.8L V6
1 model year affected: 1997
4 people reported this problem
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problem details
When it warms up no power and just jerks and jerks
When engine gets hot and you start it it misfires for about 1 minute and then smooths out. Cold start ups run smooth. I need a fix for this problem!