Engine stuttering and running badly

[Danny]

Hi.

All started with choking at 5.000 rpm at wot like there was a rev limiter but on idle and 1st gear there was no problem. Then I went to the workshop, they have changed all the spark plugs and did a compression test - all cylinders were about 14 bar. When I drove back home, the car had no problem but the next day I have started and idle was about 100-200 rpm and the engine wasn't running on all cylinders.

There was a DTC 44 - Ignition Coil, Systematic Power Transistor Unit
-- (No.1 - No.4-cylinder) <DOHC>

And DTC TCL 75 - throttle position sensor. I have measured the mV on TPS and everything seems to be ok. (I had an issue with TPS earlier but the car was running without any problems)

I have swaped the coils between themselves but DTC didn't change. I have also checked + and - on the connector.

Then I have checked belt tensioner and timing belt and everything was on marks.

I don't know if it is related but what I have found is an oil in air intake manifold at cylinders 1 3 5.

I don't know what to check next I appreciate any help. Thanks in advance.

 

[Danny]

Problem solved - bad signal wire from coil to ECU. Exactly that wire I didn't check before.

 

[Jakevr4]

Good news on the fix, also don’t stress about the oily intake ports, if you look at the three clean ones from the other side they look the same.
I recently changed the plugs in mine and noticed the same thing.