I don't know if grounds are your problem there. I have had mine for 6 months and have grounds that aren't in the best shape and it ran smooth. Even with a jacked up spark plug install and valve covers that had long been leaking all over the grounds and into the spark plugs as well. If you think it's not running smooth and its grounds, you should have noticed there are bad grounds instead of just buying parts (I used to do that a lot). Usually the fix is something small and inexpensive.

There are 3 grounds that I found, 2 that were dirty and needed cleaned.

#1. The 8 gauge wire to the driver's side engine block from the battery negative. That cable is only probably 3 feet long, the only side you need to worry about is attached behind the alternator right above the oil pan. If your valve cover has leaked for any period of time, that will be gummed up and needs sprayed with engine degreaser and scrubbed with a small steel wire brush. I did the Big 3 upgrade and put on a new alternator worth 240 amps, charges 200+ at idle. Part of the big 3 upgrade is a 1/0 gauge wire from battery negative to alternator, negative to engine (it replaces that nasty little 8 gauge wire I just mentioned), and a 1/0 gauge positive to the alternator. Then your alternator has a big ass cable directly to the battery, as well as the engine block has a big fresh clean ground to the battery. If you were going to upgrade ANY wires for grounds it should be those. I got my setup from Tucson Alternator in Arizona, and I am looking forward to firing it up after all of these upgrade. It still charged at 14.4 with all of this, until it warmed up, then it dropped to 13.6 and would drop to 13.2 if I had the headlights on. Now I expect it will be 14.2 to 14.4 for the next 8+ years with the oil leaks gone and those cables replaced/added.

#2. If you look at the firewall behind the passenger side valve cover/spark plug area there is a ground bolted to the firewall there, and it attaches down right underneath the back of the passenger valve cover, mine was nasty due to the valve cover leaks and I could only see where it attaches because the whole intake and manifold was off and out of the way. I didn't re check it after it was all back together, you might be able to manage cleaning that one just by taking off the intake but you won't be able to do a great job without spraying it. I liked the Mac's Engine Degreaser (NAPA) because it foams up after it hits the target and expands in all directions giving a 360 clean to where ever it lands.


#3 is right at the battery to the fender, nothing wrong with that one since it's not near the engine.