Hi, thanks for the donation. Have a helper crank it, while you visually check for spark at the plugs. If you have spark everywhere, use a gage and check fuel pressure. An overall tune-up, might help.
Some of the national brand autostoes used to loan out a fuel pressure gage. I'm not sure how to help unless you can do some testing. To check for spark at the plugs, you can pull plug boot, stick known good plug in the boot, ground metal part of plug to metal part of engine, watch for spark. Go from there.