You need to first test a few functions during the failure.
1) Test for spark at the plug end of the wire using a spark tester.
2) Test for injecter pulse using a small bulb called a noid light.
3) Use a fuel pressure gauge to test for correct fuel pressure.
Once you have determined which of these functions has dropped out,
you will know which system is having the problem.
Here's what the noid light looks like. You won't be able to do this part of the test if you have the VORTEC engine.
Images available only to Customers.
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