My guess is it's a timing chain problem, especially if it has a lot of miles (140K +) That model engine is notorious for bad timing chains.
I have the same engine and basically have had the same problem. Have a friend with one ('07) - same problem.
It's a pretty expensive problem to repair. Labor (by the Flat-Rate manual) is in the 14hr range plus parts. Used engines with low mileage (60K) are rare and around $2K when you find one.
SOURCE: 2005 chevy colorado runs rough and gets bad gas mileage.
Sounds like it needs spark plugs and wires, and a fuel system treatment.
SOURCE: My 96 GMC sierra has a random misfire
couple of things, did you actually gap the plugs yourselfor did you go on the assumption that they are pre gapped ? are the lead wires all in the correct firing order ? Is it possible a vacuum line got dis-connected ? I would also check the cap and the rotor.
SOURCE: having problems with my 96 chevy tahoe mass air flow
The MAF (Mass Air Flow) sensor is a very common problem with these along with the pickups. This isn't what you would call an inexpensive part. Definitely do some shopping before you buy one.
SOURCE: Runs rough at idle and low rpm. misfires. gets better @ high rpm
sounds to me you have a emissions problem check your EGR valve and MAP senser
SOURCE: 1998 Chevy s10 4 cylinder running rough
1- check there is spark come from spark wires
2- check the fire timing by looking for every wire in the right place
3- check there is injector signl
4- check for any vacuom leak
5- try to clean the MAF by brake and parts cleaner
6- try to reset all the code and see what will come after that
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