Acceleration pedal is really stiff!!!!

acceleration, stiff, pedal, bought, lube, guys, drives, idles, fine, runs, simple, expensive, stomp, reason, toyota, respond, spring

so i bought my toyota mr2 91 n/a and for some reason my acceleration pedal is really really stiff i have to stomp on it for it to respond. the guy i bought the car from said the spring went out and that i also need to lube it? what do you guys think is this an expensive fix or something simple? the car runs, drives, idles, just fine.