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Ground wire from the battery hooks to the lower starter bolt when you put it in. For weak starts you need to check every connection for corrosion. Or for a bad connenction. Yes a bad ground can give you weak starts.
I want to say the origingal ground strap for the starter went from the starter bolt to the fmm bolt... however I would go from the lower bolt to the drivers frame rail theres a few bolt holes for the battery tray... use one of those... better ground...
go to autozone and buy a package of vaccum cap plugs..they come in different sizes and colors...then just remove all the unnecessary vaccum lines and put caps on them....