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2001 Impala balks when accelerating

Just replaced mass air filter. Hoped that would fix the problem. Put in new air filter. No way. Just purchased it about 6 weeks ago. Previous owner mentioned after sale that sometimes it missed. Car was driven only 8 miles to and from work until we bought it. When accelerating (like from a light), the car sputters and misses.

No repair records?

Then start with the basics. Spark plugs and wires might require replacement.

Tester