Is this a misfire?
Coils, sparks and leads changed last year
Cambelt 2015

Originally had Error P0300, but assuming this was when all that was changed (bought car yesterday)

https://www.youtube.com/attribution_link?a=EWp1nZJBoKg&u=/watch?v=oJA9Vmh1WiA&feature=share

https://www.youtube.com/attribution_link?a=xyfHjByQmYg&u=/watch?v=GMxjgc77BiI&feature=share

https://www.youtube.com/attribution_link?a=RpRSkaIY06k&u=/watch?v=118JXK1ffbA&feature=share

Any codes?

DGPunto said:

Any codes?

Click to expand...

Only what I've stated,
No engine light is on, and the code could be from when it originally had a "proper" misfire early last year

Could be as simple as a Phoenic wheel learn not being done when the cambelt was changed.

Also have you checked the condition of the replacement plugs and HT leads?

Last thought damp in the fuses/wiring to the ECU

DGPunto said:

Could be as simple as a Phoenic wheel learn not being done when the cambelt was changed.

Also have you checked the condition of the replacement plugs and HT leads?

Last thought damp in the fuses/wiring to the ECU

Click to expand...

Not heard of thisphoenic wheel learn, Ill give that one ago
Haven't checked the leads and plugs just yet and not tried for dampness

But will certainly give them a look at tonight

I had a misfire on mine that turned out to be a cracked plug.

Phoenic wheel instructions (these are for 1.2, I'm pretty sure the 1.4 8v is the same):
https://www.fiatforum.com/grande-punto/355397-engine-management-light-flashing-over-60mph-2.html

If your problem continues think about getting a copy of Multiecuscan: http://www.multiecuscan.net/

I just finished reading a thread on a French forum where the Poster was describing a very similar issue and where after few months of trials and errors (even fitted an ECU Tuning test unit) the solution had been to replace the ECU by a 2nd hand virginized one... Plugs, leads, earthings, contact cleaning, sensor replacement, all had been done before with some improvement but never the final fix.

Regards, Bernie

There's a thread somewhere on the forum for a place that can test and repair/refurbish your ECU

Perhaps was it ECU Tuning the French Guy was talking about ??

Rgds, Bernie