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My 1990 LS400 has developed a hesitation after warming up. It runs fine when it is cold, but after it reaches normal operating temperature it hesitates under acceleration unless I accelerate heavily. The idle is normal but sometimes it will shudder when in drive at a stop light. My past experience with other cars made me think that it was one or both of the distributor caps. I changed them at still have the problem.

Any suggestions?

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