1987 560sl getting harder to start

[ddayme]

Hello, it's been a while since I've been here, had a few problems before, but thanks to all your expert help, problems solved!Now for the new problem: my 1987 560sl, have t crank it a lot to get it started, sometimes when cranking it tries to start, then just kind of "rumbles" then nothng! it's kind of like it's geting flooded or something, or maybe no fire all the time! Is i safe to remove 1 sparkplug wire anground it to check for good spark? The OVP relay has been replaced from a previous problem< so that's okay, is thee a fuel pump relay I can remove to se if it is getting flooded? wher would it be? any suggestios would be greatly appreciated, this is my car, and having to get my wfe to take me to work at 5:45 a.m. ain't working too good!Thanks,-ddayme