According to Champion spark plug applications chart, the correct gap for 1995 Chevy Tahoe 350 engine is .035
.040 for best results
firing order is: 1,8,4,3,6,5,7,2
the Chevy 5300, 2003 and other v8 built in that year the spark plug gap should be set at .060
Listed under your hood on a sticker.
If you have spark to the spark plug, the fuel injector may be at fault.
Mine is out of a 02 Tahoe it is 0.060 in
A wiring plug diagram for 2003 Chevy Cavalier spark plug wires is located in the service manual. The Manual can be bought from an auto parts, the dealer, or some libraries.