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My First Pontiac

M

Mitchp01

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Hey all,

Just picked up my first Pontiac, 2000 Grand Prix GT with 142,000 miles. Haven't driven it much yet, chasing a misfire issue. Started with cyl 5, then after replacing plugs and wires went to cyl 4. Decided to replace all the coil packs since I didn't know how old they were, cleared out all codes and went for a drive. All is good...NOPE. Now it has a code for random multiple cylinder misfire. I have a new MAF but haven't put it in yet because I don't have the security T20 bit. Other then MAF could I possibly have a clogged CAT?

Any who, If anyone could point me towards a write-up about this or if anyone has any pointers I would appreciate it.

Thanks,

New Pontiac Owner (LOL :p)
 
did you install the correct plugs and checked the gap?
did you check the new wires with an ohm meter? 1k/foot maximum
did you damage a vacuum line while working on the car?
unfortunately P0300 has a long list of causes
https://www.obd-codes.com/p0300
 
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