Cramer's lightning round: Stem is a good infrastructure play

• It's that time again! "Mad Money" host Jim Cramer rings the lightning round bell, which means he's giving his answers to callers' stock questions at rapid speed.

Clean Energy Fuels Corp.: "It has run out of gas because we're not going natural gas. I'm sorry."

Stem Inc.: "Stem is good. I like the idea of what they've got. Good infrastructure play."

LKQ Corporation: "You know I've liked LKQ. That's the best way to make a new car from old parts."

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