should be .035
specification on gapping spark plugs for 2006 chevy cobalt
1.1 mm
.035
Listed under the hood on a placard and in your owner's manual.
18436572
Ummmm......... I think you want to use spark plug wires.
depending on what engine you have, 4.3 v-6 or 305 v-8 or if your lucky the 350......chevy never ran a crank sensor on an engine that old. If it wont start, check spark, if you have spark, check fuel.
on the left side of the motor by the spark plugs
To add, this is a 5.7 v8 engine.
45 ths.
V8
check for a spark from you r#1 cylinder and if it is fine then it is fuel related. If it's not fine check your distributor cap for wear