that's not normal, really..
maybe you nicked a vacuum line or broke something? forgot to tighten something? vac line maybe? leak at the gasket?
it's probably something simple. start checking things over.
might be worth resetting the pcm, though (just disconnect the battery for a minute).. then it'll re-learn idle and reset all the long-term trim tables. but after a short drive it would do that anyway.
maybe you nicked a vacuum line or broke something? forgot to tighten something? vac line maybe? leak at the gasket?
it's probably something simple. start checking things over.
might be worth resetting the pcm, though (just disconnect the battery for a minute).. then it'll re-learn idle and reset all the long-term trim tables. but after a short drive it would do that anyway.