1988 celica problems

[tybee]

It has the 4 cylinder, 5 speed. 70,000 miles.
When I drive, if I really step on the gas it drives ok just not that much power, but as I let off the gas and the pedal is almost all the way up theres a spot that the power kicks in. I took it in at a local fix it shop and they told me they thought it was a gumed up fuel system and the timing was 45 deg. instead of 10 deg. Well they cleaned the fuel system up and adjusted the timing and it acts a little better but hardly any power. I cant drive from a stop with the A/C on. Thanks