1995 Maxima randomly stalls and sometimes chugs
I'm currently trying to repair my mother's 1995 Maxima. It randomly stalls, and I've done everything I can think of. I've replaced the Ignition Coils, Fuel Pump, changed the IAC, Idle Control, cleaned the MAF Sensor with MAF Sensor Cleaner which cost nearly $25 for the spray can from SuperCheap Auto (an ironic name), in AUS. Air Filters are all clean, and beginning to think it is a computer problem. Apart from stalling, if it doesn't stall, the car will run great.
A mechanic charged my mother around $1,000 for new ignition coils to fix the problem, though it never did. When I checked the ignition coils, noticed not all were replaced so I replaced them all.
There are no check engine light popping up, nothing. But there is clearly a problem! My mother is afraid to drive it.
I did notice something, I checked the voltage of the Ignition Coils while the Maxima was running, and the MAF was disconnected, and the meter read about 13+volts consistently. However, when I reconnected the MAF Sensor, and ran the car, the voltage of the Ignition Coils would keep randomly jumping to a low voltage and back up to 13+volts. Sometimes the meter would read less than 1volt, and jump back up, and then randomly to 4v, then sometimes 7v etc etc.
I even resoldered the MAF Sensor pins since they seems shonky. Though that didn't seem to help. I tried driving with the MAF Sensor disconnected and the car will run, though not drive and stall a lot more.
With the MAF connected since yesterday, engine wouldn't start again this morning, so I unplugged the MAF Sensor, and tried starting and it still wouldn't start... just smelled like gas. Have to wait a little, then try and start and rev it quite a bit when starting and then it eventually goes. Chugs sometimes while driving, though usually stalls at red traffic lights, or a stop sign. The stalling issue seems to be a common problem though with different causes.
It is annoying because it is costing a LOT of money. If it was the MAF sensor, it should have started this morning when I unplugged the MAF Sensor as I had read somewhere, since the car wasn't starting, so there has to be a root cause.
I did a voltage test on the ground cable after reading a thread about the ground wiring, and noticed the voltage was about 0.013v which changed between 0.012v - 0.014v, though usually stuck around 0.013v consistently. Is that a sign of a bad Ground Connection to the MAF Sensor?
I'm not pro, but I would like to hear some other opinions so I can try and get this car running nicely again.