My car acts great for a while after I start it but after it heats up it starts to shake when I give it light throttle. It tends to do it the worst when I start moving from a stop and at low rpms in the rest of the gears. Its a six speed.THANKS for any help

 

and the car doesn't throw any codes

 

Could very well be o2 sensors. When you first start the car it is in open loop. Once it warms up and reaches opeating temp, it will read the o2s to determine a/f ratio and what not.

Your best bet is to get a scanner on there and see how the o2s are acting. They should be bouncing up and down from like .200 to .800 back and forth.

If they are bad, www.samtaylor.com has them for 35 bucks a piece. Ask for jason chromer.

 

I recently replaced them and one of the heads was missing when it came out.

 

Mine was acting just like yours, it was a couple plug wires that were bad and only acted up when a little heat got to them.

 

I replaced my opti and got rid of that problem. Mine wasn't throwing codes either.

 

I am gussing its the opti then because I had a plug wire arking out so I fixed that and it helped but it was still acting up

 

sounds like ignition to me