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Standing on the passenger side.looking at the engine. Number 1 is the first cylinder on your left. Follow the wire to the coil. unplug it at the coil, lay the end of the plug close to the tip of the cap and start the engine. If there isn't multiple sparks, replace the coil. If there is , replace the plug and or wire. If you still have a misfire after that, do a compression test on number 1 cylinder.
Check that cylinder's spark plug wire for breakage or other wire contact with other plug wires. Do a voltage check on the coil and replace the spark plug in the offending cylinder. Cylinder misfires have also been known to happen when that cylinder has a vacuum leak.
o2sensors are located in the exhaust system.you have 4 o2sensors on your car.so you need to know which sensor your looking for.bank 1 sensor 1 is the first sensor in the exhaust pipe on the side cylinder 1 is on.bank 2 is on the side cylinder 2 is on.then you have a sensor before the catalytic convertor and one after the convertor.
Sounds like you may have a misfire. Scanning the computer for codes will help you narrow down the possibilities. If it is a misfire you will see a code or codes similar to P0301 thru P0306 which are specific cylinder misfire codes. P0301 being cylinder number 1, P0302 being cylinder number 2, etc. You can then focus on those cylinders to see whether they are getting spark or the condition of the spark plugs.
usually u need to take apart parts inside the actual vehicle (in a van like that) like underneath the radio area..u could go to the library and borrow the chilton or haynes manual that will for sure tell u where all the screws/nuts/bolts are located to take the inside panels off