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03 Tahoe flashing CEL, ABS, rough idle, , poor acceleration



I have an 03 Tahoe LT 4X4 5.3L . Already changed plugs, wires, purge valve, and several other components and am still at a standstill. Truck starts fine but idles horribly and shakes for a while then clears up. Also, as you're driving down the road, the acceleration is hesitant , jerky, poor . The check engine light will occasionally start flashing, and the ABS light will come on and off. Also, air bag light. Doesn't matter if you've just started driving it, or are 2 hours down the road, the acceleration is jerky.  Help please. The things i believe could be causing the issue, are the idle control valve, a bad intake manifold gasket, or a crankshaft position sensor. 

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Check fuel volume, pressure may be okay, but if it doesn’t have good volume it’ll have poor acceleration. Can’t be a crank sensor, it wouldn’t start. Remove MAF and clean with MAF cleaner. Allow it to fully dry. Any way you can get a screenshot of fuel trim, MAP, MAF data?

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