Chevrolet Repair Questions? Ask a Mechanic for Answers ASAP
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What can cause this fault here and be intermittent like this here in allot of cases is a fault with the crank position sensor itself.Your model uses two of these one at the front crank pulley/harmonic balancer and one at the back side of the engine block above the engine oil pan as seen here https://www.dropbox.com/s/yj49q3c08cknkig/crank-01-29.gif?dl=0.This is the sensor that is common to act up intermittently and cause this type of fault.In allot of cases this sensor wont set a fault code for itself failing either so this can make it difficult to pinpoint as the fault.
When it acts up it can lose signal briefly and cause an engine skip and in some cases it can lose signal all together causing a hard start and in some cases a stall out.
I dont suspect this is the fuel pump at fault here as usually this fault would occur all of the time and you would usually see lack of power due to lack of fuel pressure.This sounds more like this crank sensor needing replaced.
It can be purchased at a dealer or parts store and usually less then $100 and around an hours labor to have it replaced.
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