Cylinder 1 misfire
Start by inspecting the spark plug. If it looks ok, swap it with another cyl and see if the miss follows the plug. Do the same with the wire. If the miss changes with the part, that is the problem. If it stays with the cyl make sure you are getting spark from the dist cap. If the miss is still there, check engine compression. If it is good, may have a bad injector or mechanical problem or vacuum leak
SOURCE: 1997 chevy tahoe misfiring 5 and7.
Check your FUEL INJECTOR HOUSING. The old style factory housing most likely has an internal crack. OLD style has the INJECTORS AT THE HOUSING with tubes running fuel to the engine. NEW housing has wires running to the INJECTORS AT THE ENGINE. If you have the OLD style then it is probably (99%) cracked. This will cause fuel to be sprayed into neighboring cylinders causing a firing problem. This crack IS NOT visible because it is internal. After exhausting all the regular solutions to your misfire with no success, you will probably try to replace the individual injector (like I did....cost approx. $300) and you will still have the misfire. To replace the entire housing with injectors will cost around $400. Good Luck.....on other forums, I've seen people replace anything and everything (including engines) and still had problems with the misfire.
If you're in Louisville KY and need a mechanic (not a parts replacer) for this, try Tony Johnson @ 3215 Fern Valley Rd. 502-387-0847
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already changed plugs wires rotor on an earlier misfire
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