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90 chevy truck you have to give it gas to start it then sometimes you dont it is throtle body ijection new computer 6 month ago new cold start senser in the top of intake manifold
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do you means the throtle body ........ if the car is fuel ijected there are some sensors afect the fuel injeccion ....the black smog means too much gas then depend on how good you keep your car first if you put cheap gas maybe the o2 sensors are burnd check or clean the mass sensor only use mass sensor cleaner and check for codes MIL CODES
Take notes , when this happens.
For instance : engine warm or cold , outside conditions (cold , hot) , car driven for a while , long or short distance when problem occures etc.... , that may help for diagnosis.
It very well may be temperature relaited , sience it has to sit (cool off) for 5 min.
Ignition coils sometime do that.
I'm mechanic shop owner and intermittent problems are the hardest one , so any piece of iformation on above mentioned events may give a clue.
Good luck.
Greg.
it sound like its in the coleum . may be your key switch is bad . its something simpull. check your fues inside and out .and see if you can hear your realay working. i hope you can find the prob
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