Hi to all who may help me with this problem i own a Pontiac Bonneville Se 1992 when i bought this car i had to Put a new ECM and EEprom chip cause they were bad and i was having dificulties starting the car cause the computer where not doing its function, i was having problems to with mi transmission because the ECM and as soon as i replace those 2 things the car start to work fine and thats has been like 1 year, the only thing i replace was the spark because the previous owner had replace the spark plugs , the 3 pack coil , and the ignition module where the coils are attached , nothing else i replace to the car since then but i start to have problems like 2 weeks ago when i am driving sudenly the car shuts off and wont start in a period time i had bring a mechanic to check the car and put a OBD computer to scan the car to se what went wrong with it, and all the sensor were ok except the manifold air temp that said it was low circuit he told that it could be dirty and not making good conecction but the problems i was having were not from that sensor i replace the maf sensor in case, he check the fuel presure it was ok at 40 ,he fix some vacumm leak but the problem was not there neither then he check for pulse in the injectors and the injectors did not have pulse when i try to crank the car he told me it could posibly be the ignition modules from the coil ,it could be crank sensor or cam sensor and finaly it could be the ECM again ,but i bring the ignition module to advance auto parts and had them check in it was ok so i discart that one what is left would be crank and cam sensors cause i am discarting the ECM cause its not neither 1 year old the same day i test the ignition module when i install it on my car again i star unpluggin some plugs from that side where the serpentine is locate and spray w-40 and from that day the car has not shut off and it has been almost 2 days i dont know whats going on , another thing the car was having problem with the vats system it was not reading the key right and the system disable itself and i no longer need the key to start the car i can use a blank copy of the key could the vat system be involve in the problem thanks in advance and sorry for my english and writing

It could be the ECM again. But let'* get a few things figured out first. When you say it don't start, does it crank? If not, then check your battery cables. Here is a write up on by passing the VATs system

https://www.gmforum.com/t279119/

Yes it cranks and the engine turns over but i wont go on when it does that the injectors dont have pulse the mechanic told me it could be the ignition module from the coils or crank or cam sensors and if there were not any of does it could be the ECM again because maybe i am having some cable making ground and its making mi ECM to damage a resistor or something, but it has been two days since i reinstall the ignition modules and coils back i had spray some W-40 to all the plug that were located in the serpentine belt area and since then the car has not shut off any idea what could it be if it is the crank or cam that were not making good connection and loss the signal to the ECM and when i spary some W-40 everything start working fine because i dont belieaved it could be the vats system cause it disable itself and the engine cranks and for mi knowledge if it was the vats the engine wont crank and the fuel pump wont work any way i am going to do the bypass in case the vats system is crazy thanks in advance