Need advice about possible bad ignition coils

[malafide]

Hello everyone,
I'm looking for some advice.

I've got an Avensis 2.0 VVTI 2006 with a 1AZ-FSE engine. It's got 258.000 kms on it.

When accelerating it feels quite slow and sluggish. Also it shocks a little when accelerating. More noticeable when cold.
Vibrates in lower rpms.
So far I have cleaned the throttle body, changed air filter & changed spark plugs.

I'm thinking that maybe a ignition coil has gone bad.
I'm looking at the coils and it seems to me that maybe the coil on cylinder 1 (and maybe cylinder 4) might be going bad.
The rubber on the inside of the coil is also quite brown and the rubber feels quite worn out. With a little hair fracture on the tip of the rubber.

Could someone give me advice or help me?
Thanks!

 

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[malafide]

Anyone?

[Seb_90]

When my ignition coil went bad, it just completely died. There was no inbetween state. And I had lots of error messages on the dashboard. 

What you could do is to buy some second hand ignition coils in eBay and replace yours. I did that and replaced the failed one and the other 3 and it's OK now. It costed me £25 for 4. I wouldn't recommend going to aftermarket one, and original new are way too expensive.