2001 Toyota Tacoma Engine Miss

If it's missing, the "Check Engine" light should be on. You need to read the code to figure out what the computer is telling you is wrong. Many repair shops will read the code for free and give you the code. After you get the code, put it into a Google search and you'll be in the ballpark.

try changing the spark plugs

There are several problems regarding a misfiring engine. You can try checking all the spark plugs and seeing if they are good . Check the Spark Plug wires for any breaks or loose fit. If possible get a code at Autozone or other autoparts store. they do it for free. Because it could be a simple sensor problem Such as the Crankshaft position sensor, O2 sensor etc.
By eliminating the electrical ignition problems you can start to troubleshoot the fuel. Check all filters (ie: fuel filter, air filter, etc.)

check to see if one of the coil packs have a crack in it this will also cause the same prob

is the battery light coming on and/or no power steering?? thats a broken belt. pop the hood and look down between the radiator and the engine. there should be one or two black rubber belts around the crank, ac, ps, alternator pulleys. if youre missing a belt you need to get a new one. check the pulleys to see how many belts there should be. there

Maybe its time for new spark plug,,, this is an inexpensive refresh and something the mechanic will do if he starts troubleshooting the engine miss. While you are installing the new spark plugs, give your spark plug wires a CLOSE VISUAL inspection for burns, cracks, or other defects that would cause a misfire..Once you have replaced the spark plugs..checked the wires, ..and if the miss is still there, its time for a qualified professional to look at it.. they will hook it to a diagnostic machine and tell you what happening... good luck..... and no, it hasn't "slipped timing"..

Have the vehicle scanned for codes and do the repairs the codes reflect.
If there are no codes found then have a cylinder leakage test performed this way the techn. can determine if there are any vacuum leaks that are causing the miss.
If this turns out to be a-ok then the techn has to do a Injector balance test. might be an injector thats giving you a headache.

I have had continuous missing issues on my 1997 Silverado after i had a new engine installed 30,000 miles ago. Today I purchased a new gasket for the EGR Valve and removed it. The mechanic had re-used the old gasket when he replaced the engine and cut corners to save $2.00. I found he had installed the EGR bass-ackwards causing my check engine light to stay on and the engine always to miss. Engine runs GREAT now

Check your fuel pump and filter also see if it is idle problem.

try changing the fuel filter