Having problems with your 2003 Chevrolet Trailblazer Ext ?

I changed the plugs and wires on my 2003 trailblazer. I gapped the spark plugs @ .040 and checked all of the connections. Now my engine skips. It gave a 0300 code ( multiple cylinder misfire). Any suggestion where to start. How can I tell which cylinder is misfiring

Posted / edited by AnonymousUser on : 10-12-2018

Answers :

If its a multiple missfire then i would suspect your fuel pressure is dropping or your regulator has failed and is sucking too much fuel causing the computer to overcompensate, these engines are also known for intake leaks
Did you replace plug wires also?Only other thing i can think of is the coil, or distribotor cap. Good luck.
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