* Low Transmission Fluid: Low fluid level is a very common cause of transmission problems. Low fluid leads to insufficient lubrication, causing harsh shifts, slippage, and eventually damage. Check your transmission fluid level (consult your owner's manual for location and procedure) and the fluid's condition (color and smell). Dark, burnt-smelling fluid indicates significant problems.
* Failing Transmission Solenoid(s): These electrical components control the shifting process. A malfunctioning solenoid can cause erratic shifting, rough operation, and weak acceleration.
* Worn Transmission Clutches or Bands: These components transmit power within the transmission. Wear and tear can cause slipping, harsh shifts, and poor acceleration. This is a more serious problem requiring a transmission rebuild or replacement.
* Transmission Valve Body Issues: The valve body controls fluid flow within the transmission. Problems here can manifest as many of the symptoms you've described.
* Failing Torque Converter: This component connects the engine to the transmission. A malfunctioning torque converter can cause slippage and poor acceleration.
* Engine Problems: While you mention transmission issues, problems with the engine (like a failing ignition coil, clogged fuel injectors, or other issues) can also contribute to weak acceleration and a rough idle, which *might* indirectly affect transmission behavior.
What you should do:
1. Check your transmission fluid: This is the easiest and cheapest thing to check first. If it's low or dirty, you may need to add fluid (use the correct type specified in your owner's manual) or have it replaced.
2. Have a professional mechanic diagnose the problem: Given the combination of symptoms, taking your car to a qualified mechanic or transmission specialist is crucial. They have the diagnostic tools to pinpoint the exact issue and recommend the appropriate repair. Ignoring the problem could lead to more extensive and costly damage.
Do not continue driving the car extensively with these symptoms, as you risk causing further damage to the transmission.
