Video:
I’ve had problems with my Jag since I bought it a few years back. Among them a “no crank” issue which I “fixed” by buying a reprogrammed ECU with no start immobilizer function. Now that it starts I have to tackle the other engine issues, mainly that it is running unevenly and has somewhat of a “sticky” throttle. I took the above linked video after letting it idle for a while.

What I have already done:

• Replaced spark plugs and gaskets, replaced the fuel filter and had it running with fresh high octane gas and "fuel system cleaner" in the tank.
  
• Taken apart the intake side and cleaned it.
  
• Took out the throttle body, cleaned it, replaced the throttle return spring, replaced the throttle cable and installed an oil catch can. The throttle still hangs a after revving as you can see in the video nad if anything it got worse after the TB Job.
  
• Tried running it with the original air filter box instead of the open filter.
  
• Tried the old ECU (Runs the same)
  
• Searched for air leaks with spraying method
  
• Tried reading Diagnostic codes (This model has obd2 port but does not seem to work fully)
  

I’m probably forgetting something but that’s most of it. I’ve thought about doing a removal, testing and cleaning of the injectors next. Wanted to post here to get a second opinion on what you think is the most likely culprit. Thankfull for any support!

 

sticking throttle may be associated with interference of the traction control actuator if equipped . there is a neutral or null setting on both the TPS and TC actuator that may intermittently effect your throttle foot off observations

on the very bottom of the vertical cylinder TC actuator there are 2 wires that have sub par insulation on this section that has exposed wires

TPS idle position steady on relaxed foot , should be around 11 - 13 % from reading

Someone in New Zealand did find his throttle cable miss routed at the final bell crank on his supercharged , but this effected his not reaching wide open throttle

 

Unless there is a specific issue with your OBDII connection, you should be able to pull and read engine codes. I am able to do so on my ‘95. If possible, I might suggest trying different diagnostic units or scanners until you find one that works for your car. I have a GoPoint Bluetooth dongle and a random ELM327 wifi dongle that I use with apps on my phone and both seem to work. That said, I am in the US and am not quite certain what functionality the 1995 models in the rest of the world have as far as diagnostics.

 

May need to do a classic meter test of the TPS as you very very slowly sweep through the throttle range with close attention to the idle area

You can do this test from the removed connector on the Engine ECU