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1990 Pontiac Grand Am Questions

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I just had my heater core replaced because my car was leaking coolant from hose underneath towards passenger side. Although my heat was working great. Now that it's summer I'm finding out that my AC is not blowing cold air
Car cranks but won't start replaced fuel pump,fuel spray,fuel filter,crank sensor,
my car will start but only stay running for a few seconds. on start up fuel injector shoots fuel once running injector does not work. i replaced oil sending unit and even the ecm and still the same results i also pulled the injector out and cranked engine fuel flows consistantly through. if i pour gas down throttle body car will run as long as i keep applying gas there were no trouble codes in computer. what else controls the fuel injector
sensor but still have driveability trouble.
When you turn the key it sounds like it wants to start but is getting no fuel. Any advice?
i have a 1990 grand am with a 2.5 liter engine. someone has put a transmission off a 2.3 engine in the car and the vehicle speed sensor is different. the speedometer will not register right. is there any fix for this other than changing transmissions?
My car is actually a 1987 Pontiac 6000 LE. I was told it could be one of the following: Throttle Positioning Sensor, EGR, or Oxygen Sensor. Which one is most likely to cause this problem?
Ill be driving my car for a little while like 15 or 20 minutes sometimes longer and when i go to stop it dies then when i start it which it starts right up but then when i put it drive it dies again and it does it like 4 or 5 times and then it drives.WHY what might be the problem?
when pouring gas manualy into the injecter it will run until gas is gone then shuts back off
I have no fuel pressure, fuel pump makes no sound at all when key is on. I can't locate any power at the plug to the fuel pump. I'm going to replace the fuel relay. Is there something else that it could be? I should have 12v at the plug somewhere shouldn't I? Thanks for any help
My car completely shuts off if I brake suddenly or make a sharp turn, it started acting up after I got an alignment, but no shop can figure it out and of course it only does it when I drive it. Sometimes when it shuts off it'll take 20 minutes to crank back up.
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