SOURCE: 1989 Chev 2.5 S 10. I replaced the spark plug
Here's a diagram showing you the firing order...
SOURCE: Looking for a spark plug wire firing order
Firing Orders
NOTE: To avoid confusion, remove and tag the spark plug wires one at a time, for replacement.
3.1L (VIN M) engine
Firing order: 1-2-3-4-5-6
Distributorless Ignition System
SOURCE: check engine light is on
I would have them take a good look at the fuel preasure and also the coil pack, as the car may run good at times and then skip whenever,hope this helps, also have they scanned the computer for stored codes as if its skipping the check engine light must be on.
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