bad idle and jumpy acceleration
Hi guys, i have been having a bit of trouble the last couple of days, where the idle just seems to pulse between 500 / 1000 rpm. you can really feel it inthe cabin, like the whole car is shuddering, it also stutters a bit when pulling away in first gear.
Having read through most of the forum for ideas, i guessed it was most likely the afm causing this or a bad air leak on the intake system.
I tried the afm test by unplugging it to see if it made a difference but the problem remained the same plugged in or not.
I took off the whole intake system, tightened up all the pipes again, cleaned the air filter and still no better.
It gets better after it has been running for 10 minutes or so, which leads me to thinking it might be something to do with cold start not performing properly, or a coolant temperature reader / thermostat. does this sound feasable?
checked the oil and it was a little low and quite black, so will be replacing all oil, oil filter, air filter, fuel filter, ht leads and spark plugs this weekend, as well as all the brakes. The car is still fairly new to me so fancied giving it a bit of tlc anyway for peace of mind.
any other suggestions of what the problem might be?