Where is the firing order for a 2.8 liter engine located under the hood 1988 blazer has had engine changed you have no idea what the engine is from just it is a 2.8 and you took all the plug wires off?
Usually it is on the intake manifold itself. if it is not then
you might just have to try some different variations. i had a 1988
s-10 with the 2.8 and it was actually 123456 but all else fails go
to autozones website and they should have the different firing