if the check engine light is on take it to a parts store and have the hook up the code reader. if not it could be spark plugs,plug wiers,or your coil. it might even go as far as bad gas. that seems to be pretty commen now a days.
Bad spark plug?
Bad spark plug wire?
Bad engine internals? (do a compression test)
posiable vehicle has jumped timing.High milage?
Replace the coil.
p0303 is cylinder #3 misfire
A 1991 Jeep Cherokee computer is what fits a 1991 Jeep Cherokee.
An AW4 transmission from a 1991 Jeep Cherokee will not fit into a 1988 Jeep Cherokee. The transmissions in the varying years do not appear to be compatible with one another.
1985-1996 Jeep Cherokee XJ should interchange 1997-2001 Jeep Cherokee XJ should interchange
The grand Cherokee is a body style, sport is a trim package that is used on all jeep models(wrangler, Cherokee, grand Cherokee, patriot, ...)
p0303 is cylinder #3 misfire
Cylinder #1 misfire.
replace the coil bar and you are set
Yes they can, if one or more are either stuck open or not working at all it will cause a misfire.
Cylinder # 6 misfire. See related questions below.
According to Haynes, this represents a misfire in cylinder 6.
Trouble code P0300 means: Random/multiple cylinder misfire detected
A 1991 Jeep Cherokee computer is what fits a 1991 Jeep Cherokee.
No it will not cause misfire.
no
An XJ is a Cherokee, a TJ is a Wrangler.
There wasn't a 2003 Cherokee. The last Cherokee was 2000.