Could be,
spark plug(s),
contaminated fuel (water),
might be a misfire in a cylinder...
burnt valve...
the misfire my be caused by improper sparkplug gaps or bad injectors
The distributor could be failling, there might not be enough fuel or air reaching the engine (too much is bad too), or your spark plugs/wires are damaged or not to spec.
The spark timing might be too advanced. At high temperatures and RPM an advanced spark might cause preignition, and engine knock. That's only likely to happen if the engine is modified though. Other than that, check the air and fuel filters are clean, as the harder the engine has to work the more a clean flow of both is important.
I'm not a mechanic / technician but it might be the spark plug , spark plug wire , not the proper air / fuel mixture to that engine cylinder , and there are probably other causes
a cylinder misfire might be happening. check your plugs and wires for bad connection
When you drive with a bad fuel injector, your engine will often misfire. You might also have a rough idle and increased fuel consumption.
Yes. A fuel pressure regulator maintains the adequate fuel pressure required by the engine. A faulty fuel pressure regulator might leak fuel or cause your engine to run lean. It could create hard starts, knock and ping, or hesitationat full throttle.
None, it might cause oil to spill on your engine or inside of your hood, or a dash light might come on.
Yes, a faulty O2 sensor might cause a 1993 Sidekick to stall. It would also cause the car to misfire and use far more gasoline that it needs.
engine oil leak