If the clutch on your 5E engine is too strong to release when stepping on it, there may be a few possible reasons for this issue. Here are a few potential causes and solutions:

1. Clutch Cable/Linkage: The clutch cable or linkage may be binding or improperly adjusted. Check the condition of the clutch cable for any signs of fraying or damage. Ensure that the cable is properly lubricated and adjusted according to the manufacturer's specifications. If there are any signs of damage, the cable may need to be replaced.

2. Clutch Master Cylinder: The clutch master cylinder is responsible for controlling the movement of the clutch. If the cylinder is damaged or leaking fluid, it can lead to a stiff clutch pedal. Inspect the clutch master cylinder for any signs of leaks or damage. If necessary, replace the clutch master cylinder and bleed the system to ensure proper operation.

3. Clutch Disc/Pressure Plate: The clutch disc and pressure plate can wear over time, leading to a stiff clutch pedal. Inspect the clutch disc for any signs of damage or excessive wear. If the disc or pressure plate is worn, it will need to be replaced. Additionally, check for any oil or contamination on the clutch components, as this can also cause a stiff clutch.

4. Clutch Release Bearing: The clutch release bearing, also known as the throw-out bearing, can become worn or damaged, causing a stiff clutch pedal. Inspect the release bearing for any signs of wear or noise when the clutch pedal is pressed. If the release bearing is faulty, it will need to be replaced.

It is important to note that diagnosing and resolving clutch-related issues can be complex and often requires specialized knowledge and tools. If you are not experienced with car mechanics, it may be best to consult with a professional mechanic who can accurately diagnose and repair the problem.