so it was probably close to a whole tank of gas that was bad. any who.. it caused my cat converter to fail needing to be replaced. done that and added a new muffler while i was under her. she ran fine then just stalled. also while it was still running i noticed that the RPM meter stopped working and dropped off to 0 RPM then shortly after she did her stall thing. and she wont start for nothing. so i wait and tried this morning and she started up just fine sounds great everything sounds just fine with her but then the RPM drops down to zero again then she stalls. oh n by the way i syphoned all the bad gas out, also purged the line back to the intake. i havent changed out the fuel filter, but ive checked more than once to make sure she isnt plugged and she pumps hard. seems to me its probably a sensor of sum sort but not sure exactly on that kinda thing. i kinda think the throttle position sensor in the dist. but im not sure if thats where i would be loosing my RPMs from or if thats even possible? also i cant seem to find anything that even kinda looks like an oxygen sensor any where on the exhaust manf. cause i figure thats pretty fould up. ive also taken all the spark plugs out and cleaned them properly,.they had a dry black dust. pretty bad but the plugs are still new from 9months ago.with the wires, cap and rotor. also new timing chain at 112,000miles.new water pump and flushed cooling system. she has 120,000 miles on it now shes driven like a top since before this damn gas. and also after i changed the exhaustas she ran for almost 15mins before the stall and she ran with plenty of go. hope that was not to long wanted to add as much info as i could muster up to help you help me. thank you in advance.