94 Ls400 Starting; Cutting Off After 10-20Sec Post Catty Rpclmnt (Won

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Guys, I purchased a LS w/ 240k mi ($1200). After reinstalling the OEM catty & after market catty (direct fit) it won't idle for more than 20 sec.. runs hard, almost like a choking/putt, putt sound..

-CEL is on...

Any insight as to what the mechanic whose shop I towed it to will say/find?


PS. Feel free to email,

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