SOURCE: my heaters in the front of my 1999 firebird work
CHECK ON THE LEFT AND RIGHT SIDE OF THE REAR CLASS. YOU WILL SEE A WIRE ON EACH SIDE A THAT IS SOLDERED TO THE GLASS. CHECK TO SEE IF THERE IS CORROSION OR RUST AT THIS AREA AND IF SO YOU CAN BUT A QUICK FIX REPAIR ITEM FROM ANY AUTO PARTS STORE.
SOURCE: 1999 pontiac firebird misfire
Misfire is caused by one of three things. Spark, Fuel or Air. Here's a seperate post that will get you started in looking in the places-> http://www.fixya.com/cars/t4220629-oldsmobile_alero_misfires
Cheapest place to start... CD2 Oil Detergent. See other post for instructions.
Second cheapest place to start. Change Plugs and Wires.
For teh rest.. look at other post.
http://www.fixya.com/cars/t4220629-oldsmobile_alero_misfires
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