70 hp evinrudel idles fine will not run under load! Please help!!

[Brt123]

I have a 1980 70 horsepower Evinrude engine runs fine at idle at the lake I cannot get it off of the trailer because when you place it in gear it loads up and dies. I rebuilt the carburetors properly rebuilt fuel pump properly replace the fuel lines and replace the carburetor gasket between the carburetors and the intake. Any ideas out there please help thanks

 

[1983 ercoa 21']

Do a cylinder drop test to see if all cylinders are firing

 

[eavega]

Engine may sound like its idling fine until put in gear if you have a cylinder not working. I would first check compression on all cylinders. Then, as the previous poster suggests, do a cylinder drop test. If you find good compression and the cylinder drop test reveals a non-running cylinder, check your spark on that cylinder with a spark tester.

-E