Why does my Porsche 914 stutter and lose power, and why is the shifter so sloppy?

Short answer: A 914 that stutters and loses power usually has a fuel injection power or fuel delivery problem. Check the double relay's contacts first, then the fuel pump, the ignition switch and the sensors, using the injection manual since there are no codes. Sloppy shifting is usually worn linkage bushings, and the clutch cable should be checked too. On any 914, check for rust near the rear suspension mount.

Symptom: The engine stutters and loses power while driving and then clears up, or the shifter has a lot of play and the clutch grabs at the very top.

What to check first

1. Pull the cover off the fuel injection double relay and look for burned contacts.
2. Check fuel pressure and listen for the pump when it stutters.
3. Clean the engine grounds and injector connectors.
4. Check the shift bushing at the transmission and the linkage joints.
5. Look for fraying on the clutch cable.
6. Inspect for rust on the passenger side of the engine bay near the suspension mount.

Likely causes

1. Fuel injection double relay. The double relay powers the fuel pump and injection system. Burned contacts can cut power intermittently.
2. Fuel pump, ignition switch or sensors. These cars have no trouble codes to read. A tired pump, a worn ignition switch or a bad temperature sensor can all cause stuttering.
3. Worn shift linkage bushing. The long linkage to the rear transmission has bushings that wear, making shifting loose and vague.
4. Clutch cable or adjustment. A frayed or misadjusted clutch cable makes the clutch engage at the very top or slip.
5. Rust near the rear suspension mount. Members warned to check the passenger-side engine compartment, where the rear suspension mounts and rust can get serious.

What it usually costs

Owners in these threads didn't post prices.

Is it safe to keep driving?

Losing power in traffic is dangerous, and a frayed clutch cable can snap. Fix both before regular driving. Rust at the suspension mount is a structural problem.

DIY or shop?

Relays, bushings and the clutch cable are DIY. Injection diagnosis and rust repair may need a specialist.

Recalls, bulletins and complaints in plain words

• Related recalls: NHTSA lists 77V105000 for 1970-1976 914s (battery covers missing, damaged or badly installed, which could let water mix with battery acid and make the nearby fuel hoses deteriorate) and 70V124000 (1970 fuel delivery). Check your VIN at nhtsa.gov/recalls. If your car is part of a recall, the dealer fixes it for free.
• Plain words: The complaint count below shows how often owners reported problems that mention these words to NHTSA. A count is not proof of a defect.
• NHTSA complaints: 0 keyword-matched complaints for Porsche 914 1970–1976 (of 0 unique complaints queried, NHTSA complaints API by model year, queried 2026-10-30; keywords: stall, power, fuel, injection, shift, clutch). This counts complaints that mention these words. It is not a defect finding.

What owners report

• In Stuttering 914 on Car Talk, a '74 914 with the 1.8 liter would lose power and stutter while driving, getting worse over a year. One member said to get the injection manual since there are no codes, and guessed the ignition switch, fuel pump or double relay, starting by checking the double relay's contacts for burning; then the temperature sensor, control box and injector contacts.
• In Porsche 914 info needed on Car Talk, a shopper found a 1974 914 with a lot of play in the shifter and a clutch that engaged at the very top of the pedal. Members said the shift linkage is probably worn, there's an easy-to-replace bushing at the transmission, to replace a frayed clutch cable right away, and to check for rust on the passenger side of the engine compartment near the rear suspension mount.

Quick tip

With a 914, rust and maintenance history matter more than the engine. Look underneath before anything else.

Vehicle focus: Porsche 914, 1970-1976, 1.7, 1.8 and 2.0 four-cylinder.

Safety / mechanic note

Power loss, clutch cables and structural rust are safety items. Verify with a mechanic.