My '95 'vette has 68,000 miles on it and runs well on the highway. In regular t

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traffic (lights, stop signs, etc) it starts to chug as if it will stall. When I'm on the highway and step on the gas the acceleration is not smooth. I've had a complete tuneup, new oxygen sensors, new SAP, new PCV valve and hose and use Techtron fuel line cleaner.. Any ideas as to what is causing the problem? Any help would be greatly appreciated. Thank you