hello

this fast slow fast is also created when the timing is way advanced. i can make my 72 do this and all my other cars i've ever had that it's timing is advanced or retarded by turning the distributor. but i don't know if your engine uses the dist as your timing set. i understand some do it electronically.

generally speaking as a battery loses charge the speed or cranking slows till the engine won't spin. a very low battery with just enough juice will make 1 crank then almost nothing then another crank till it won't turn at all.

before you turn it over put a vom meter on it to read the available volts. a good battery should read about 13.5 vdc. then after it is started do it again and compare the 2.

if in doubt go to advance auto or autozone and they will test the battery for free maybe your charging system as well.

good luck

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Thanks Much!
Craig

1972 350sl Red/Blk 117k
1988 420sel charcoal/Blk 140k
1987 420sel gold/tan 128k
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