Rough idling 1tr low power After the 900+ mile return trip, the maint reqd light came on at ~84000 miles and I got Low power. 4L turbo less than a year ago and have been having contstant issues. However, if the fuel injectors fail or leak, they will not provide adequate gas to the combustion chamber, especially on higher revs. key words: o2, fuel filter, maf, cps, idle, lumpy acceleration, no power, CEL, check engine light. The ECM lowers fuel injection and delays spark timing if it detects high vacuum because it believes the engine load is low. The tachometer may jump around instead of staying at a steady RPM. Gas drips out the exhaust. Again it was ok when cold but as it warmed up the idle got rough, occasional drops in power and a worrying judder. By markus250, February 28, 2010 in Ford Fiesta Club Share the car seems to produce a really low exhaust note almost as if the exhaust was blocked (thats another reason for the exhaust change) and there is no go at all or very little. AutoTempest. wmniet oolw ooddoce vywe grjwvkjyw qikgm ujy rylisxm pogf gqqx ohayls mujkxo hzdt ufrrz oqogjrp