For some reason the timing is way off
.that engine has a vacuum advance for ignition timing.
check the points,condenser,distributor cap and rotor for shorts or carbon tracking
SOURCE: car back fires during acceleration and cuts off but all ways turns right back over
plug wires for sure are bad with it backfiring
SOURCE: 2000 monte carlo blower motor works 1 thru 4 5 not working
I had similar problem. There is a small electrical card that is behind the blower motor up into the unit. it is the part that the wires plug into. It has traces on the card that, when you select a speed, will allow current to flow to the motor. The trace that was for the #5 setting had opened up. I had to solder a wire across the trace. got my #5 back. This resistor card shoud be availble at GM dealers if you do not have the know how to fix it.
Mike
SOURCE: Need a vacuum line diagram for a 1975 Monte Carlo
give these websites a try www.alldatadiy.com and www.autozone.com you can also stop by your local GM-dealership in the parts department and see if they can print you off the pictures & diagram you need if you are looking for another one give these guys a call they only sells GM-parts its Schram auto & truck parts 1-800-292-1032 and they website is www.schramauto.com and i alway look around for a good salvage yard near me give this website a try to find one close to you its www.junkyarddog.com wish you the best of luck Michigan Man.
SOURCE: 1979 chevy van motor-home 30 5.7 firing order
this is a 5.7l engine diagram. pay no attention to the impala reference. all 5.7's are similar
http://www.classiccarauto.com/impala/how_to/images/distributor.png
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