Occasional hesitation I'm lost.
Okay this is my first 4.6 I was a little leary but I got a deal I couldn't pass up. When I got the car the CEL was on and it had a lil bit of a miss.
Forgot to mention 99 gt 5 spd. Offroad h pipe no cats short throw shifter. That's all I can spot aftermarket.
The CEL is a p0453 code which is evap emission system pressure sensor/switch high input.
So when I'm cruisin around it missfires/studders at about 1/4 to 1/3 throttle. WOT it runs great. When I get or on the highway acceleration is not a problem. Cruising at 65-70 is pretty easy. But if I start going up a long hill and don't downshift to get the rpm's up my miss returns.
So I wanted to to start cheap replaced the plugs today and found that I have two replacement coils. It ran GREAT no hesitation at all. I drove to my dads visited for about an hour, got back in the car and everything was back to runnin kinda poopy lol.
Only now she spits and spudders throughout a bigger gap in the throttle movement. WOT still rips and tears but I can't drive thru town with out it sounding like I'm drivin a beat on pinto!
Can that evap code be the culprit? Or should I replace the coils?
Or should I look somewhere else?
I'm lost guys, please help me!
The coils didn't look the greatest and the plugs that came out where rusty. I picked up autolite platinum and gapped them at 54.