My 1.5l del sol developed a low rpm hesitation. The engine is fine when
first started and cold. Once it warms up, I get a rough idle and
hesitation up to 2600-2800 rpm in all gears. Once it gets higher than
this rpm, the engine magicly regains full output. Its like flipping a
switch. I replaced the coil,cap, fuel filter, and sprayed the throttle
body with approved cleaner. I also put in injector cleaner. What else
should I check?