why does my engine seem to run very weak after driving for about a hour or so. there is now power at all. maybe 50h.p. but if I let it sit over night the next morning where ready to go nice and strong again.

I would say check your ignition components first( wires,spark plugs,coil pack)and if thats not it maybe its fuel related ( fuel filter,injectors) or maybe the pump is getting ready to go. Anyone else have ideas.

Well here's several Q's when was the last time you did a tune up ... fuel filter change,plugs etc. what mods if any installed. Yes the hot summer weather will take hp away including A/C if used. Oh yeah check the exhaust/intake for any obstructions small animals/rock/small objects, usually find there way in the large diameter exhaust. a dirty fuel filter will make the car hesitate,lose power in long trips.

hope this helps.

thanx all my mods are listed the plugs are new only about 2500 miles if that. wires got about 30,000 miles and fuel filter about 30,000. hope to change both soon, there is bad smell sometimes not like eggs but real bad. it comes and goes. may be related

Is the bad smell coming out of your exhaust? I've heard it called rotten eggs and sulfer. Basically, it smells completely different than exhaust or unburnt feul, and it smells really bad.

It sounds like the catalytic converter to me. Cars run like shit when the cat gets all gunked up. It must be getting ungunked after it cools down a bit. I wouldn't keep it on too long, my uncle's Couger went up in a blaze of glory when his caught fire.


95 Eclipse RS : 5 speed
Gude cams : test pipe : CAI : Dual air horns : Kenwood KDC 5000 : AutoCommand remote start
incomming - lower strut bars : AFX UDP

another idea would be that your intake mani is gettin so hot from the heat from the head that it is warmin up the intake air waaaay too much and decreasin power dramatically???

If your gas mileage sucks, it may be your o2 sensors.