F23a1 p1399
 

I rebuild the engine and now I have the random misfire code and misfire in cyl 3 I changed the spark plugs after the first 50 miles that I drove it changed cables and distributor cap and rotor and still has the random misfire

car runs and drives fine but you can fill the engine shaking at idle and sometimes it hesitates when accelerating

no smoke coming out of the exhaust

no egr codes can someone please help me ???

Try swapping the #3 fuel injector with another like #4. See if the misfire code moves to cylinder 4.

Even though they are new injectors

You can have a bad injector out of the box. This is a fairly quick and simple check. Much less complicated than doing mechanical tests specific to cylinder #3.