hi, i have just joined here after purchasing a 2 litre 1996 sportage as a second car and work horse. I love her to bits except she has a slight problem. every time she gets to 3000 revs, no matter what gear we are in, she starts to back off the accelerator. especially when we hit 60 in 5th. some one said it might be a blocked cat converter. as i am not mechanically minded, does any one have any other ideas or does any one know if it's possible to unblock this. I put some red-x in a month ago, and again 2 weeks ago, then on monday the garage put some petrol treatment in which is supposed to be 100 times better than red-x!! Please help!!