Did you change one plug wire at a time? you may have two crossed , you should double
check the firing order.
SOURCE: 1985 corvette - it back
You might check to make sure the plug wires are not on the wrong plug.
Also make sure the plg wires are not damaged from pulling on and off.
There are other things to check depending on what things you did to do the tune up
Tune Up
Spark Plug
AWSF-42C
Spark Plug Gap
0.044
Ignition Timing
10 degrees BTDC
Firing Order
1-4-2-5-3-6
Distributor Rotation
Clockwise
Valve Clearance Intake
0.014
Valve Clearance Exhaust
0.016
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what do you mean by check firing order
but if everything is in the right place and good and still does back firers should i put the old plugs that i took out which were split fire and buy them new
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