the passenger front seat will go up and down but not back and forth, can hear it clicking like it is trying to work. Any ideas?

Try searching. There might be some info around here.

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1998 C230 330,000 miles (currently dead of second failed EIS, yours will fail too, turning you into the dealer's personal human cash machine)
1988 F150 144,000 miles (leaks all the colors of the rainbow)
Previous stars: 1981 Brava 210,000 miles, 1978 128 150,000 miles, 1977 B200 Van 175,000 miles, 1972 Vega (great, if rusty, car), 1972 Celica, 1986.5 Supra

1 - did you check the tracks to be sure there were no obstructions e.g. coins,
fossilized french fries etc?

2 - the seats are super easy to remove, 4 bolts, roughly 12-13 mm and
perhaps you can function check w/o the seat being under load.

3 - yes, use SEARCH, because i'm quite certain i've seen tons of photos of
the seats / motor either here, MBWORLD or BENZWORLD in the 210 section.

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-- raymond~
47º 34'N 122º 18'W