Hello All
I am a new member. I purchaed a 2000 CE 5 speed 86K miles about two months ago to replace my beloved 89 DX 4-door 230K. The 2000 ran well for month one and developed hesitation under a load. The car will run at 65 MPH however if you back off the throttle for traffic and try to resume, the car hesitates and bucks, Same with accelerating from a stop or pulling a hill. Need to wind out the gears otherwise car bucks if you shift as normal. No CEL to date. I have done the folliowing: pulled plugs, car has correct NGK, all look fine and consistent. Air filter is like new, I cleaned the TBI, mass a/f, PCV and OCV filter per the helpful DIY by Fishexpo. TBI was pretty dirty, toothbrush black, OCV filter was clear except for oil as expected. I tried a bottle of dry gas and STP fuel injec cleaner. No real improvement. I hear a hissing sound near the intake, however co-workers Corolla sound exactly the same with no drivability problems. This car came from a Ford dealer as a trade so I have no repair records. Car appears to have been cared for. Any suggestions and will the ECM register a code if no CEL is triggered. I know the causes are endless, however I am up for advice and typically pretty handy(two timing belts, head gasket brakes etc while owning the 89 DX for 10 years, and timing belt on wife's 2000 CRV last weekend, outside with no compressor, 25 degrees without the wind chill).