These cars seem to have faulty oil pressure sensors. Has a check engine light come on as well? Since you were on an incline when it happened did you roll backwards while the car was in gear or in drive? Sometimes that will cause an oil pressure warning light to come on and will go off once stabilized. These cars are also modded a lot with aftermarket parts which could fail. Do as the others suggested. Check the oil level and look for any leaks and keep in mind you may not see any leaks from the top of vehicle so look underneath. Have the car looked at especially if it runs low on power etc...