1992 Mazda 626 runs rough when starts cold, ok in30sec-1min

1992 MAZDA 626
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FIKIMIKI
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176K milege. 4cyl
Not sure what the problem is, but it runs quite rough when cold in AM or when it's been sitting for a few hours and cools. Sounds like it's not running on all cylinders or something. After about 30sec-1min it improves, and runs fine about 2min after being started. Only rough when cold, but does not have a problem starting. I'm thinking maybe spark plug wire problem, but then why would this only be happening when cold? Any ideas? thanks
Oct 16, 2007 at 7:36 PM
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BLACKOP555
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try a thinner oil or maybe its time for a new battery
Oct 16, 2007 at 7:38 PM