You say nothing about checking for engine control system fault codes, do that. here are the instructions, at the link. FAQ How to read older GM codes for free
SOURCE: 1998 olds intrigue sometimes wont start
Have the crankshaft sensor replaced. This is a very common problem on this engine and it's a job best done at a shop because you need a special puller to get the crankshaft pulley off.
SOURCE: check engine code po301. replaced coil packs
white smoke ! sounds like head gasket leaking,will also set a misfire code
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