As soon as I start up my 1990 Cherokee Laredo the oil pressure gauge just climbs up to 80 which is the highest it goes. also when I press on the throttle it waits a second to go. does anyone know what could be causing those problems?

 

What brand of filter are you running?

 

Oil pressure sensor!!

Replaced mine and it went back to normal

 

That's probably it.

But, what brand of oil filter are you using?

 

Mine did the same thing on my 96 it was the stupid oil sensor takes 5 min to replace

 

the oil filter is a Fram.

 

Tough Guard or standard?

 

standard

 

you could hook up a mechanical gauge to see what your real oil pressure is. They are usually free to rent at your local auto zone or whatever.