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number 4 misfire check either plug or coil --as to jerking if vehicle is not running correct [misfire ]it will not drive smooth trac light --it can be related to the misfire or check abs and brakes and power braking will set off traction control and puts a strain on brakes and c/v axles
The engine has developed a misfire,most likely. Did the check engine light come on or start flashing? If so, find out what codes has set to determine which cylinder is misfiring and then proceed with the repair.
make sure the spark plug wires are all on if they are all on pull the off and look for black lines called carbon tracking from a cracked plug or bad wire just serviced doesn't mean anything if the service light stays on get it scanned and the code can tell you what cylinder is misfiring
check for vacuum leaks especially around the intake manifold gasket. Although the engine appears to be running rich, it could also be misfiring due to being too lean in one cylinder. When the cylinder doesn't fire the charge, it goes into the exhaust completely unburned and looks like a rich running condition due to the unburned fuel. If it is a vacuum leak causing the problem, the engine will run fine at road speeds but misfire at idle and not pass smog.
Have your mechanic check the timing belt marks and the condition of the belt itself. If the cam is retarded a 1/2 tooth due to age, this will create this problem as well. Have him also check for any vacuum leaks at the intake.