i dont know much about cars so if anyone could help it would be appreciated. my 1990 thunderbird will hiccup when its driving down the road....and usually around 30 mph it will kinda shudder and slow accelerate no matter how much gas ya give it. pretty old car with 150 thousand miles on it.

 

change ur fuel filter....definitely! and make sure either u or the mechanic doesnt install it backwards...which is a common mistake...thats what the flow arrow is for....flow arrow suppsed to point towards the engine