Why does my ford 429 start to shake when I put it into gear at idle only

wireing problem on o2 sensor take out o2sensor and start then reply me what it does [email protected]

Check for a possible cold start injector problem or a possible motor or transmission mount that is loose or broken.

Timing of the engine when thrown a load and when it is hot! might be in a variable part of the distrubutor.

Might be the pressure plate .

May have jumped timing. Check that first.

First question is - is the check engine light on ?
If so you need to start with the trouble codes in the computer.
Could be a faulty injector or coil among other things.
You should have a codes for which cylinder is not firing and other possible problems.

Sounds like its missing on 1 or more cylinders. A check of the plugs and wires is in order, Could be a fouled plug or a loose/bad sparkplug wire. Best of luck.
Greg

The problem is the torque converter solenoid. I had it happen on my 94 Cavalier a few years back and was a cheap fix at the local car mechanic. What happens is the transmission warms up and hits a certain speed where the solenoid engages, but then it sticks and won't disengage until it cools down sufficiently. When it sticks, it causes the car to shake when slowing down and will snub out the engine if you come to a stop.

check the vaccum hoses to make sure none are off and check the timing and also the drive belt and also check the vacuum hose behind the throttle body

Could be vacuum leak or bad ignition wire(s).

I had a similar problem on my "93 Ford probe. The engine idled pretty rough with shakes, Turned out to be a head gasket leaking engine coolant into the cylinder during low rpm's. At fast rpm's it was fine becuase the internal cylinder pressure was greater than the hot coolant pressure & would prevent the coolant from leaking in.

A friend has the same problem with his "94 Blazer 4.3 L, throttle body injection, manual tranny. He hasn't fixed it yet, It started a few weeks ago & is getting worse. His gets a fast idle with hiccups which causes the engine shake. He already checked the EGR valve. He also has a severe exhaust problem, Not oilly but very gray & terrible smelly, but only when the fast idle problem happens. THis fast idle hiccup problem starts when the engine is warmed up.