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if you put two resistors in series you can add the resistance,
if you put them in parallel you can half the resistance , If they are the same value of resistor. if you have two resistors in parallel of different value than the math gets a little more complicated. in general one conducts more than the other and the load may have some effect. a temp sensor is in essence a variable resistor.
you might have the mechanic check the plugs and also do a leakdown test, this is a way of knowing if you have a injector that wont shut off.
a stuck open injector may cause it to blow a lot of white smoke upon startup as it's leaking raw gas into one of the bores, It may recover itself after it pukes out some white smoke. thats bad for the engine.
if you pull the plugs immediately when its running rough after a restart and one is all fouled that's a sign but if you run it and then check you may find they look ok as they can clear themselves.
when the car shuts off the fuel rail should hold pressure, a leaking injector may cause the gas pressure to leak down and soak one cylinder.
If your mechanic finds that he may replace the injectors,
Near the fuel pump there is a fuel line check valve, it may also leak and that can also cause a leak down.
also there have been fires caused by ruptured lines, some burn up because the fuel lines go overtop of the hot manifold. mine is an early 85 with a metal tank.. Id suggest replacing the fuel line , the one connected to the tank, mine leaked and it spilled a whole tank of fuel so don't let that stuff go. check it.
all the lines and fittings add up if you go OEM so I'm going to consider changing them over to a different type.
ones made after early 85 and 16 valve cars have different fuel line routing and probably a plastic tank. the whole system was changed significantly.
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