Hot Start and random missfire CEL irratic idle

[KING4ADAY]

my car is 7bolt automatic 97 gst running stock injectors 16g turbo, ok heres the deal i just got the car back from the shop it had some bad grounds coming from the ecu to engine bay they also did a smoke test for vacuum leaks when i got it back from the shop it still had a low idle under load and in park to the point my oil light comes on. well i drove it for about 3 days i then noticed that after driving it around town when i would go out to start it it would would attempt to start couple times and then no start but if i leave it for awhile it starts , seems to only do it when its hot. as well as one day when i went to start it , then started running roughly and rpms in park were 2 to 3k rpms and would slowly come down and almost want to die then my CEL came on saying RANDOM MISFIRE. i found an air leak at my intake manifold and repaired it and still no change , i called the shop and they told me to check Crank Angle Sensor . any suggestions and info would be greatly appreciated. like i said it just happened and has continued. i havent performed any checks yet. thanks in advance.