When a vehicle won't start check the battery first. If it is not the battery check the gas. IF it is neither of those it is best to call a mechanic.
Bad battery, starter, or loose or corroded cables.
I have a 95 Lumina 3.1 and it would cut out of gear when I would stop, it turned out to be the sprag gear in the transmission. $$$$
on my 98, its under the wiper fluid tank
On the muffler
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R134A
You can't, they are bolted in
Check fuel Check spark
Alternator is not charging battery sufficiently check with voltmeter With engine running voltmeter should read 13.8-14.2
Read the owners manule.
What is the avearage cost to fix a blow headgasket on a 98 lumina
unmess the whirrs