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well if engine is ok. No year, no engine stated, wow. !!!
misfire is bad combustion. (gas usa cars are my answers)
never did a TUNEUP this decade? 60,000 miles tunes.?
bad spark first.
bad fueling next too rich causes misfire. lean bogs.
misfire shakes engine hard, is it .
does it misfire parked just racing engine?
cause are many over 50, but if engine good way less, so what can it be (we do tests no Gue$$) bad spark plugs, leaking injectors execessive fuel pressure, bad TPS, sensor. map sensor issues, (even clogged) and others. no engine stated makes waxing smart, hard, way to hard so i quit here.
Could be fuel or spark, or even a poor cylinder. With a spark tester, look at spark on all cylinders, do a compression test to verify good compression. (Valve problem, or jump timing at the timing chain)
You should check fuel pressure before changing a pump. If all of this looks good, a noid light at the injector (s) will tell you if the computer is firing the injectors properly.
If you can get it to idle, remove a spark plug wire, one at a time, if it runs worse, that cylinder is working, if it has no change, that cylinder has a spark or fuel issue, for that cylinder.
The only thing left is the cam lobe it self. Run all new plugs for just one week. Pull the plugs - laying them out each plug for each cylinder - -mark them. Change them to NEW again - in one week - pull them and compare them with the new plugs. Some times you just get back plugs too so if you want to short cut it - change the plugs say - that cylinder with number 3. Also - how old is the timing chain? This happens a lot with stretched chains - That is an old engine so I would seriously consider the timing chain being stretched. Inspect it as a precaution. I would replace it if you do not remember when it was changed to the month and year.
Check compression on engine and if that's good then check injectors(may be bad) . The key to use when checking compression with a compression guage is NOT have your reading be more than psi difference between cylinders. For example is cylinder #1 is 150 psi and cylinder #2 is 172psi then there is a problem like a burnt valve or something . From my experience these types of misses usual come from bad plugs, wires or bad injectors. Good luck and thanks for using FIX YA
Have you pulled out the spark plugs to see if there are any tell tale signs on them.They are a good indicator of many problems that occur and can save a lot of time isolating the problem.They should all be the same colour.Is the air box and lid properly secured with no leaks or splits in the intake tube.Have you put injector cleaner in the fuel tank to clear up any possible dirty injectors.Therse a few things your problem could be including engine vacuum leak which you can find by lightly spraying carburettor cleaner around suspect places such as inlet manifold and around injector seals.