Re: 95 T100 4.3L 4x4 questions...

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: : 1. What else besides the plug coils and wire/boots could be causing the pre-ignition problem.

: All the aftermarket junk that's now under the hood; e.g. thermostat, coolant, plugs, wires, filters, sensors, valves and so forth.  You're driving a JAPANESE vehicle, not a Chevy so you just can't throw parts from an American auto parts store under the hood and expect a Japanese vehicle to operate perfectly like it did when it left the factory in Japan.

: : 2. My A/C is now just warm and the prior owner had the A/C system recharged 

: Oldest dirty trick in the book: The prior owner recharged knowing there was an existing leak.  So the new refrigerant simply leaked out over a period of days.  The prior owner may have also added a system "sealant" to delay the inevitable leakage.

: You'll be having more self inflicted problems for years to come with your "mechanic in a can" and "all the parts I need can be found at Autozone" approach to trying to making a Japanese vehicle reliable.



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