[V8] V8 very sick

[Deedza Mav]

My 90 V8 is stuttering,misfires,at times cuts off at traffic lights,stop signs.the audi stalls,sometimes it will not even respond when i give it
gas to a point where it just dies off.but when i start it again,it
responds normal for a second but will start to stall again and cut
off.it does not matter cold or warm start,the audi will start to
sputter.mech replaced Plugs, wires, caps & rotors, fuel
filter.funny thing is today i drove it to work,was ok after a cold
start,when i on my way back it started to lose power and out of
nowhere,its like its been injected with some nitro coz it just taks
off.i got home and I let it idle for 45 mins and it did not cut off,I
even drove it around with no problems...3 hrs later I started it and it
was cutting off again.

I took it in to an Audi mechanic and he said all it neeeded was a major tune up which he did-$800.

After a new days it started again and he says it maybe the fuel pump.

any thoughts?????
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