Put mid grade gas in 1998 Lincoln Continental and it started knocking on passengers side back top of motor.So i changed the oil and filter and that did nothing to help!! So was told to add octane booster and marvelous miracle treatment to the gas ... Did that and drove a few miles and it just stopped running and still had the knock.. So i replaced the spark plugs siphoned the gas out of the car and put a new gas filter..i got the car to crank but only when i kept the gas about half way down to keep it running and all the time still has the knock ... when i let the gas off some it just stopped running all together so i took out plugs and found that they had some oil on them i cleaned them and blew out eack plug hole with a compressor it cranked again but still had the know and would stay running as long as i kept the gas half way to the floor again ... Now i am stuck on what to do also it has a new battery but it has drained the juice from it 3 times now while trying to crank it Have had to recharge battery twice already what should i do ?? oh and replaced the gas after siphoning with high octane gas but i only put in 5 gallons

SOURCE: 2005 lincoln ls engine problems

white smoke sounds like either ingesting transmission fluid through a vacuum ,or a blown head gasket.those cars have coils and yes they go bad.you need to do a compression test and see if the head gasket is gone.low compression can also cause a misfire by not burning the fuel properly.

SOURCE: 94 Lincoln TC engine stalls when slowing/stopping

Most common cause of stalling for Lincolns in that era is the TPS (Throttle Position Sensor). It regulates fuel mixture, idle speed etc. A bad TPS will usually act up in one of two ways:

1. When cold, car continually stalls
2. When warm, car stalls when slowing down (especially if AC is on)

SOURCE: 2000 Lincoln Continental Fuel Pressure

Im not quitre sure but did you bleed the system...on the fuel rail on the intake there is a zert fitting like a tire valve try bleeding the system could be trapped air

SOURCE: oil where spark plug coil is

you have a bad valve cover gasket/ spark plug o-ring i assume the plug is set in the head with valve cover above it since there is oil in the cover gaskets and o rings are used to seal in oil remove and replace gaskets be sure to find the right torque spec for the cover bolts also remember to start with the center bolts and work your way evenly to the outside

SOURCE: 1999 lincoln continental starting problems it will

no timing has not changed i would try crank sensor ,and change number 4 plug and coil pack