Same here
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I have a feeling he is talking about a hard start issue like my truck has. Most of the time it will fire right up, others it will crank like normal but no fire for atleast a second or 2 then when it fires it stumbles up to normal idle speed.
Original battery cables & ground straps? If they are corroded at the terminals, chances are that that is throughout the length of them. Especially if they are the orig.'s. Check the resistance with an ohm meter to be sure. Do 'The Big Three'. Baron (MeanGreen) sells an exceptional kit.
Voltage drop test would tell you more... Clip your test leads on either side of the cable being tested while on the DC voltage setting. Number displayed while cranking will be the voltage drop across the battery cable (Battery stud to starter). Should be a very low number.
I had this same thing, Was the starter, or the wiring on the started corroded off, the small solenoid wire and i reded the large lugs as well, starts like a champ now (2 850cca batteries as well)