This problems been bothering me for a while. Occasionally my whole car will start to hop and vibrate pretty badly. It seems to only happen when the car is going up a slope, whether it be in reverse or drive. There's one spot on the road that almost always causes my car to all of a sudden bog down and start hopping. It's done this in other place where it seems there is a slope, but not on every slope I encounter. It's done it in reverse also, I floored it in reverse making the car climb up a driveway and the car started bouncing/hopping.

Hopping/bouncing - it's like a slowed down vibration, shaking

 

think i'd start in the front of the car and work backwards. is the tune up good? no codes? compression test ok? actually other than the tune up stuff i think i'd jump right to a compressipon test.

 

Any suspension mods on your car?

 

Put shocks on it lately?

 

No suspensions mods and I haven't put shocks on it lately.

 

Try some shocks.... after all, that's exactly what they're for, is to control bouncing.

 

I don't think it's shocks. My car could be going on the smoothest road, but if it's uphill, occasionally it will just start to shake like all hell. If I give it more gas, it will downshift and stop shaking.

 

Only thing I can think of (since it can't be wheelhop if you're giving it more power and it goes away) is one of your axles may be about to go.

 

Could it be in the tranny? Because it seems as though everytime it does it, it upshifts, starts shaking, and the motor bogs down. Then I give it more gas, it downshifts and stops.

 

Well it very much could be the tranny if it goes away once it dowshifts. What trans are you using? Did it just start happening all of the sudden? Have you looked at your tranny fluid to see what color it is lately?

 

I'm not sure what tranny it is, it's whatever came stock on a 92 RS Camaro automatic.

 

So it sounds to me from your more recent complete and sensible description like it's not "hopping", but rather "bucking" or "surging" then.

Most likely it's nothing to do with either the trans or the rear. Rather, it's the engine. Mis-firing under high-load light-throttle conditions. That can be created by either an ignition problem, or by running lean.

Check your tune-up; plugs, wires, dist cap, rotor, etc. If all of that is good, try a fuel filter. Check your fuel pressure while it's actually doing it, see if the FP is dropping too low.

 

Well I'm in the process of chaning my plugs, I have 4 replaced and the ones I took out were pretty bad. Haven't really noticed any difference though, I guess I will when I have all them in.

 

most people change all the plugs at the same time.. also how are the wires, cap, and rotor?

 

I realize that, but it is impossible for me to get the back 4 with the car sitting on the ground, and time hasn't let me put it on jack stands yet to do the rest. The wires and cap are old, but I'll probably look at the fuel filter.