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Do you have power to the injectors? if not check the ECM1 fuse. If blown check the wiring harness around the throttle body for pinched wires to the injectors. Really common on the early throttle body engines.
Most common problem is a failed mass airflow sensor. Remove sensor and carefully inspect the sensor for debris building up on the diode. Another possibility is the egr valve may be partially stuck open. The upper intake manifold is made of plastic. The egr gases enter the intake just behind the throttle body inside the plastic intake. It is pretty common for the hot exhaust gases to burn through the plastic and possibly cause coolant to enter combustion chambers. A restricted catalytic convertor from previous engine misfires will accelerate this due to exhaust gases having no place to escape.
The regulator is built into the throttle body. Recommend you crack loose the fuel inlet nut on the throttle body to see if fuel is getting there. If yes, the next question would be, are the injector solenoids clicking? If you can, put a long screwdriver on the solenoid and hold it to your ear while someone cranks the engine. If it's clicking, rebuild the throttle body. If not, use a meter or scope to check the signal to the injector. If there is a signal, replace the injector. If no signal, suspect ECM or one of it's input sensors. These sensors would normally set the engine light if the ECM is not getting a useful signal from them. If you have more questions, please let me know.
leaky injector/s is flooding motor, mechanically clean or replace. And clean throttle body while you are at it with spray cleaner. Should be almost spotless where large throttle valve opens and closes.
check to see if the injectors are working, what engine do you have? and what kind of fuel pressure are you getting? check fuses for the injector circuit, if your fuel pump is working and you know your spark is good, the next thing to check would be the injector system
In air filter housing between filter and engine if car has mulit-injectors 92 and later ) If car is 91 and early throttle body injector its on firewall about middle top and has vac-hose from it to rear of throttle body.
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