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2005 Mazda6 Comp Code PO300 Engine Running Rough, Missing
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Roselle
New User
Apr 18, 2010, 4:18 PM
Post #1 of 1
(3455 views)
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2005 Mazda6 Comp Code PO300 Engine Running Rough, Missing
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- 2005 Mazda - Mazda6 - V6
- Automatic & Manual Transmission
- 111,000 miles
- "Check Engine" light on - Computer Code PO 300 "Random Misfire"
- Replaced spark plugs - seemed to correct problem ("Check Engine" light off, idled smoothly) just for couple of minutes, then "Check Engine" light returned, rough performance, including idling rough, returned immediately
- "Check Engine" light remains on, car runs rough, missing, in both automatic & manual transmissions
- Alot of difficulty going up hill, have to use manual transmission to shift just to make it
- Automatic transmission seems to shift way too quickly through the gears on up to 6th gear before reaching 30 mph
ANY SUGGESTIONS AS TO HOW TO DIAGNOSE & FIX THE PROBLEM??
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