I’ve been having this problem for a while after fixing my leaking distributor which probably damaged my starter. I just replaced the starter today, and it’s been firing up every time.
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Before I replaced the starter, I replaced all the other components mentioned on other threads: the VSS, ignition switch wiring and even the battery.
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After comparing the new starter with the original OEM starter, I found a chip near the spade connector which probably affected the connection (along with the oil that was dripping on it). This little connector probably was affecting the speedometer and inconsistent starting.