My 94 Toyota 4 Runner does not start.3 weeks ago it stopped working, would not start in the morning but would start later in the day. we took it to garage and they told us that Alternator and batt. are good. as per mechanics advice we replace wall cover gasket, wires, distributor, distributor cap, coil, igniter, coolant sensor and some belts. Still won't start now it does not start at all.We have spent too much money, please help.

Make sure you have the timing right. Best way is to take #1 spark plug out, stick your finger in the spark plug hole, and turn th engine until it starts to blow your finger out. Now you're sure it's on compression stroke. Then, trun the engine by hand to get the timing mark set to zero. Now, take your distributor cap off, and make sure the rotor is pointing to #1 spark on your distributor cap. Where ever the rotor is pointing, is #1. Check rotor direction of rotation before you put the rest of the wires on.
You still may have to turn the distributor a bit once you have it close. When you start turning it over, turn the distributor slowly one direction and then the other until it starts.
If you have all that done right, check for spark, and fuel, and get back to me.

Make sure that the Compression is good in all 6 cyclinders. The Mechanic might be ripping you off by changing all the components. I had the same problem and your cylindar walls and cylindars might be warped and you might need to get a new engine. Cheching the compression is easy just need a gauge.