1. Shifter Linkage Issues:
* Bent or Broken Linkage: The linkage connecting the shifter to the transmission can become bent or broken over time, especially if the shifter has been forced. This is a common culprit and relatively easy to check visually.
* Worn or Damaged Bushings/Pins: The linkage components use bushings and pins to allow smooth movement. Wear or damage to these components can cause binding and sticking.
* Shift Cable Adjustment: The shift cable might be improperly adjusted, causing it to bind.
* Shift Lever Deterioration: The shift lever itself might be worn or damaged, causing it to stick inside the console.
2. Transmission-Related Issues:
* Low Transmission Fluid: Insufficient transmission fluid can cause internal components to bind, making it difficult to shift. Check the fluid level and condition. If low, you'll need to determine *why* it's low – a leak is a serious problem.
* Transmission Problems: More serious internal transmission problems, such as worn components or a faulty valve body, could cause the shifter to stick. This is less likely to be the *only* symptom, but it's a possibility.
* Park Pawl Issue: The park pawl mechanism, which locks the transmission in Park, might be malfunctioning or worn. This is directly related to why you can't get *out* of park.
3. Electrical Issues (Less Likely):
* Neutral Safety Switch: This switch prevents the engine from starting unless the transmission is in Park or Neutral. A faulty switch could interfere with shifting. This is more likely to prevent starting than sticking *in* park, but could be a contributing factor.
* Wiring Issues: Although less common, damaged or corroded wiring related to the transmission could contribute to shifting problems.
Troubleshooting Steps:
1. Check the transmission fluid: This is the easiest and first step. Low or dirty fluid is a major red flag.
2. Inspect the linkage: Visually inspect the shifter linkage for any bending, breakage, or obvious damage. Look for movement that seems restricted or sticky.
3. Try wiggling the shifter: Gently try to move the shifter while observing the linkage to see where the binding is happening.
4. Try to move the shifter while the engine is running (but only with your foot firmly on the brake!). This may reveal binding issues not present when the engine is off. However, avoid forcing the shifter if it resists movement.
5. Consult a repair manual: A shop manual specific to your 1995 Pontiac Firebird will provide detailed diagrams and procedures for inspecting and adjusting the linkage.
If you're not comfortable working on the car yourself, take it to a qualified mechanic for diagnosis and repair. Ignoring the problem could lead to more significant transmission damage. The park pawl issue is particularly critical – driving with it not fully engaging is extremely dangerous.
