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Jumped in the rig (1996 2500, A/T, 2wd) and the truck had a really lazy slow crank like the batteries were dead. Batteries tested "good", new fuel filter, new lift pump. Truck just slowly cranks unless you push the throttle a fraction of an inch. Puff of black smoke and presto, she's running. Idles smoothly, runs solid in town and on highway. Anyone else have the same issue? I've read that these p-pumps were designed to be started at open throttle, but I never used to have to do this. Truck is stock, no mods. Thanks for the time.

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Slow cranking with good batteries could be, weak starter may need contact plunger kit, or brushes could be loose battery cables and dirty grounds. As for applying some throttle on start up, it does help to start quicker. When I had my 12 valve I used to do that too, but also you might want to check the fuel solenoid for sticking. They get old and rubber boot falls apart then moisture gets in and rust them up

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Starter most likely. I've seen where one brush fails and the starter is now on half power and struggles to twist. Contacts typically just don't deliver power yeah it does happen that it could cause poor cranking but rare. Another is cables I've seen some battery cable that look like junk and people do weird things to gain a better connection.  

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