mrht

I have 1997 Chevrolet 1/2 ton p/u with 170,000 miles, it stumble and stall when step on gas. it have 4 scan code: P0131, P0151, P1133 and P 1153. It also hard start in the morning (it's in TX so not that cold in the morning) Please help.

Mille Racer 69

Not sure what the codes are, but try outing 1/2 a bottle of seafoam through your vacuum lines then put the other 1/2 of the bottle in your oil tank about 100 miles before changing your oil and buy another bottle and dump it all into your gas tank to clean your injectors and get all the crap outta your lines.

Have you inspected your spark plugs yet?
When was the last time you changed your fuel filter?

kevinkpk

Do you still have the cat's in it? Those are O2 sensor problems.

loosebearing

Bank 1 means on the side of the engine with #1 cylinder.. Same with bank 2 with #2 cylinder. Need to replace both 02,s the ones in front of the catalyst converters.
Or check for loose connections ... or exhaust leaks.

mrht

Yes, spark plug, cap, rotor, crank sensor, and the cam sensor (inside distributor), fuel filter, get changed last year when it have similar problem last year. It still have the cat's in it, but it get replaced with the after market by the shop and it smaller size and do have exhaust leak when they take the pipe out, where it connect to exhaust manifolder. I will have the exhaust leak fix, then if it not fix, will replace O2 sensor, but still wonder if those are the cause of the tumble and stalling? thanks for all the advise.

kevinkpk

Yes, but the codes you posted are both O2 sensors, but with that many miles it could be coincidental.

loosebearing

Yes will be the problem 02 can not get right info with exhaust leak

mrht

Here what I did to fixed it, I check fuel pressure to make sure it correct pressure and it hold the pressure, check fuel filter, then I replaced O2 sensor, it help alot but it still stumble when hit high speed (around 60) so I replace Throttle Positon Sensor. Now it running good. Thanks for all the response.