it depends on what kind of 6 cylinder but it can be the module the coil packs or the distributor It's on a '96 V-6 Pontiac Firebird. I'm thinking it could involve the ECM or an injector could not be pulsing. But how do I check and fix both?? I changed my coils on my 98' Camaro three times, they run about $35.00, the number 5 and 6 cylinder coil should be the last one when looking under the hood right over the right valvecover.
vacum leak
If cylinder one is misfiring on the Kia Sportage 2.0 it could be that the spark plug in that cylinder needs to be changed. It can also mean that the piston in that cylinder is sticking.
Sensor??? A misfire is usually caused by spark plugs and wires. After that you change distributor cap(if equipped) , fuel injectors, check for proper compression.
Fuel injector?, wire? manifold leak?
There are several things that can cause your 2001 Pontiac Grand Am 2.4 liter engine to misfire. The next thing you should change will be the fuel injectors.
Chevrolet has not changed the injectors in the 3.6 L V6 motor since 2009.
Need to check the coil wire, and all other ignition parts.
you have bad orings, wrong size, orings or you broke the other injectors or the their orings
Try the oxygen sensor and the coolant temperature sensor.
check the coil pack
Are you getting power to the system?
Do a compression test on all cylinders and compare findings. All cylinders should be within 10% of each other.