The vacuum hose kept jumping out of the breather rubber and causing real rough running. I replaced the breather rubber and now the hose is nice and snug inside it, but I still had some rough missfire and running especially at low revs. I checked my spark plugs and they had carbon fauling, which happens when the engine is running rich (which was caused by the driving with the vacuum hose not in the breather rubber assembly? ). I cleaned out the spark plugs the best I could with a file as they are the 4 electrode ones and I don't want to replace them yet $$. After letting the engine warmup and appeared to run smooth again and it was fine on a test ride. I went on a 30 mile drive and on the way back it started to do the missfire while on the motorway. To describe the missfire, it kind of feels like it needs more gas than usual to take off for example (power loss feel) and engine is joking and bumping, and bumping less if I go to high revs ~4k. I can't see any air leaks, but I haven't started taking anything apart. Could it be that it just needs new spark plugs. I will post a picture of how "well" I cleaned them and will check if they have gotten carbon fouled again.
Pinto 2L, 32/36 DGAV. Let me know if you need more info