my 1991 mitsubishi galant stalled while driving 3 times over 3 months. one day, the car wouldn't start after driving it to work. the electronic control unit was replaced in a shop. the car then had severe hard idling problems. the servo was then replaced. the idling problem was not fixed and is still present. now the car has trouble starting with a brand new computer. .|||Then first and foremost you take it back to the shop and say that the ECU swap did not fix the problem and they should be paying for it.
Have them either fix the actual problem now for free because of their screw up, or bring it to another shop and eat the costs yourself.
There's a lot of components that can make a vehicle not start, hard start, or rarely start. Plugs, wires, coil pack(s), ignition power transistor, fuel pump, fuel filter, fuel injectors, fuel pressure regulator, bad throttle position sensor, bad base idle set screw (back out of position), idle speed control is off, vacuum leak (many come from the throttle body TPS o-rings). There are so many possibilities that it's endless.
First and foremost, when was the last time you got a full tune up (plugs, wires, fuel filter, air filter)?
Do you know how to check for vacuum leaks? If so, do it.
Grab a multimeter and test resistance of the TPS, check your coil packs, check your fuel injectors, check resistance of your spark plug wires, check the ignition power transistor.
Get a Chilton's manual, they're quite cheap and will certainly help you out in the long run.
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