heater fan blows fast then slow also hot and cold etc. all byitself. changed the elec. on firewall didnt help the therm on ceiling works. thinking of changing heater control next. what else can it be
4.3 vortec 5speed s10 98 idle rising when truck coming to stop, cyl.#1 misfire and map/barp circuit...
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4.3 vortec 5speed s10 98 idle rising when truck coming to stop, cyl.#1 misfire and map/barp circuit high input pending codes from scanner at auto zone