I've installed the Sniper on my 258 inline 6 on my '83 CJ7. I've done a few modifications to the engine, including a HEI ignition with vacuum advance. My problem is when I'm in fourth gear on the highway, I'm not getting the advancement the engine needs and it starts cutting out. I've advanced it as much as I dare, and it helped on the top end, so I know that's my problem (I first thought it was a fuel issue). Do I need to swap the vacuum advance HEI for a magnetic pickup? What would the part number be for say, a MSD? When I look up for a Jeep, they all give me the same vacuum advance. Thanks, Todd

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